Stages of Meiosis

Stages of Meiosis

Stages of Meiosis Animation

Premeiotic cells have two copies of each chromosome (2n), one derived from the paternal parent and one from the maternal parent. For simplicity, the paternal and maternal homologs of only one chromosome arediagrammed.

All chromosomes are replicated during the S phase before the first meiotic division, giving a 4n chromosomal complement. Cohesin complexes (not shown) link the sister chromatids composing each replicated chromosome along their full lengths.

As chromosomes condense during the first meiotic prophase, replicated homologs become paired as the result of at least one crossover event between a paternal and a maternal chromatid. This pairing of replicated homologous chromosomes is called synapsis. At metaphase, shown here, both chromatids of one chromosome associate with microtubules emanating from one spindle pole, but each member of a homologous chromosome pair associates with microtubules emanating from opposite poles.

During anaphase of meiosis I, the homologous chromosomes, each consisting of two chromatids, are pulled to opposite spindle poles.

Cytokinesis yields the two daughter cells (now 2n), which enter meiosis II without undergoing DNA replication. At metaphase of meiosis II, shown here, the chromatids composing each replicated chromosome associate with spindle microtubules from opposite spindle poles, as they do in mitosis.

Segregation of chromatids to opposite spindle poles during the second meiotic anaphase followed by cytokinesis generates haploid germ cells (1n) containing one copy of each chromosome (referred to as chromatids earlier).

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    NATTVNEG-6MC
    Select Currency //563.00
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  • NATtrol Strep A Verification Panel

    NATtrol Strep A Verification Panel

    Select Currency //886.00
    NATtrol Strep A Verification Panel - 24 x 0.1mL  
    NATSAVP1-C
    Select Currency //886.00
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  • NATtrol Strep A Positive Control

    NATtrol Strep A Positive Control

    Select Currency //448.00
    NATtrol Strep A Positive Control - 6 x 0.5 mL  
    NATSPY-6MC
    Select Currency //448.00
    Qty in Cart: 0
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  • NATtrol Strep A Negative Control

    NATtrol Strep A Negative Control

    Select Currency //448.00
    NATtrol Strep A Negative Control - 6 x 0.5mL  
    NATSDG-6MC
    Select Currency //448.00
    Qty in Cart: 0
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  • NATtrol Shigella sonnei

    NATtrol Shigella sonnei

    Select Currency //298.00
    NATtrol Shigella sonnei- Stool Matrix 0.5 mL  
    NATSSO-GP
    Select Currency //298.00
    Qty in Cart: 0
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    Select Currency //298.00
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  • NATtrol Salmonella typhimurium

    NATtrol Salmonella typhimurium

    Select Currency //298.00
    NATtrol Salmonella typhimurium - Stool Matrix 0.5 mL  
    NATSTY-GP
    Select Currency //298.00
    Qty in Cart: 0
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  • NATtrol S.pneumoniae

    NATtrol S.pneumoniae

    Select Currency //316.00
    NATtrol S.pneumoniae
    NATSPN-NNS
    Select Currency //316.00
    Qty in Cart: 0
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    Select Currency //316.00
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  • NATtrol RP Multimarker Control Pack

    NATtrol RP Multimarker Control Pack

    Select Currency //744.00
    NATtrol RP Multimarker Control Pack - 6 X 0.75 mL INTENDED USE: NATtrol™ RP Multimarker Controls (MDZ001) consist of in vitro diagnostic external run controls intended for use with qualitative molecular assays. The routine and repetitive use of...
    MDZ001
    Select Currency //744.00
    Qty in Cart: 0
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    Select Currency //744.00
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  • NATtrol RP Controls

    NATtrol RP Controls

    Select Currency //701.00
    NATtrol RP Controls - 12 x 0.25 mL  
    NATRPC-NNS
    Select Currency //701.00
    Qty in Cart: 0
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    Select Currency //701.00
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  • NATtrol Rotavirus

    NATtrol Rotavirus

    Select Currency //298.00
    NATtrol Rotavirus- Stool Matrix 0.5 mL  
    NATROTA-GP
    Select Currency //298.00
    Qty in Cart: 0
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  • NATtrol Respiratory Verification Panel 2

    NATtrol Respiratory Verification Panel 2

    Select Currency //1,171.00
    NATtrol Respiratory Verification Panel 2 - 23 x 0.6 mL Ea  
    NATRVP2-BIO
    Select Currency //1,171.00
    Qty in Cart: 0
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    Select Currency //1,171.00
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  • NATtrol Respiratory Syncytial Virus Type B Stock

    NATtrol Respiratory Syncytial Virus Type B Stock

    Select Currency //1,021.00
    NATtrol Respiratory Syncytial Virus Type B Stock - Quantitative1 mL PRODUCT DESCRIPTION:NATtrol™ Respiratory Syncytial Virus Type B Stock* is formulated with purified, intact viral particles that have been chemically modified to render them...
    NATRSVB-STQ
    Select Currency //1,021.00
    Qty in Cart: 0
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  • NATtrol Respiratory Syncytial Virus Type A Stock

    NATtrol Respiratory Syncytial Virus Type A Stock

    Select Currency //1,021.00
    NATtrol™ Respiratory Syncytial Virus Type A Stock* is formulated with purified, intact viral particles that have been chemically modified to render them non-infectious and refrigerator stable. Each vial contains 1.0 mL of NATtrol™ Respiratory...
    NATRSVA-STQ
    Select Currency //1,021.00
    Qty in Cart: 0
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    Select Currency //1,021.00
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  • NATtrol Respiratory Pathogen Panel -1 NATtrol Respiratory Pathogen Panel - 1

    NATtrol Respiratory Pathogen Panel -1

    Select Currency //712.00
    NATtrol™ Respiratory Pathogen Panel-1 (NATRPP-1)* is formulated with purified, intact virus particles and bacterial cells that have been chemically modified to render them non-infectious and refrigerator stable. NATRPP-1 contains a total of 6 x 0...
    NATRPP-1
    Select Currency //712.00
    Qty in Cart: 0
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    Select Currency //712.00
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  • NATtrol Respiratory Panel 2

    NATtrol Respiratory Panel 2

    Select Currency //705.00
    NATtrol Respiratory Panel 2- RP2 Controls Ea PRODUCT DESCRIPTION: NATtrol™ Respiratory Panel 2.1 (RP2.1) Controls* (qualitative) is formulated with purified, intact bacterial cells and viral particles. The microorganisms have been chemically...
    NATRPC2-BIO
    Select Currency //705.00
    Qty in Cart: 0
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    Select Currency //705.00
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  • NATtrol Pneumonia Panel-Quantifiable Bacteria NATtrol Pneumonia Panel-Quantifiable Bacteria

    NATtrol Pneumonia Panel-Quantifiable Bacteria

    Select Currency //996.00
    NATtrol Pneumonia Panel - Quantifiable Bacteria - 17 x 0.2 mL, 3 x 1.2 mL PRODUCT DESCRIPTION:NATtrol™ Pneumonia Verification Panels: NATtrol™ Pneumonia Panel– Quantifiable Bacteria (NATPPQ-BIO)* and NATtrol™ Pneumonia...
    NATPPQ-BIO
    Select Currency //996.00
    Qty in Cart: 0
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    Select Currency //996.00
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  • NATtrol Pneumonia Panel-Atypical Bacteria & Viruses

    NATtrol Pneumonia Panel-Atypical Bacteria & Viruses

    Select Currency //779.00
    NATtrol Pneumonia Panel - Atypical Bacteria & Viruses- 12 x 0.2 mL, 2 x 1.2 mL  
    NATPPA-BIO
    Select Currency //779.00
    Qty in Cart: 0
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    Select Currency //779.00
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  • NATtrol Parainfluenza Virus Type 4 Stock

    NATtrol Parainfluenza Virus Type 4 Stock

    Select Currency //1,403.00
    NATtrol Parainfluenza Virus Type 4 Stock - Qualitative 1 mL  
    NATPARA4-ST
    Select Currency //1,403.00
    Qty in Cart: 0
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    Select Currency //1,403.00
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  • NATtrol Parainfluenza Virus Type 3 Stock

    NATtrol Parainfluenza Virus Type 3 Stock

    Select Currency //1,403.00
    NATtrol Parainfluenza Virus Type 3 Stock- Qualitative 1 mL  
    NATPARA3-ST
    Select Currency //1,403.00
    Qty in Cart: 0
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    Select Currency //1,403.00
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  • NATtrol Parainfluenza Virus Type 2 Stock

    NATtrol Parainfluenza Virus Type 2 Stock

    Select Currency //1,403.00
    NATtrol Parainfluenza Virus Type 2 Stock- Qualitative 1 mL  
    NATPARA2-ST
    Select Currency //1,403.00
    Qty in Cart: 0
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  • NATtrol Parainfluenza Virus Type 1 Stock

    NATtrol Parainfluenza Virus Type 1 Stock

    Select Currency //1,403.00
    NATtrol Parainfluenza Virus Type 1 Stock - Qualitative 1 mL  
    NATPARA1-ST
    Select Currency //1,403.00
    Qty in Cart: 0
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  • NATtrol Parainfluenza Control

    NATtrol Parainfluenza Control

    Select Currency //488.00
    NATtrol Parainfluenza Control- 6 X 0.5 mL  
    NATPIV-ERC
    Select Currency //488.00
    Qty in Cart: 0
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  • NATtrol Neisseria gonorrhoeae Z017, External Run Control, Medium

    NATtrol Neisseria gonorrhoeae Z017, External Run Control, Medium

    Select Currency //644.00
    NATtrol Neisseria gonorrhoeae Z017, External Run Control - Medium - 6 X 1 mL  
    NATNG-ERCM
    Select Currency //644.00
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  • NATtrol Neisseria gonorrhoeae Z017, External Run Control, Low

    NATtrol Neisseria gonorrhoeae Z017, External Run Control, Low

    Select Currency //574.00
    NATtrol Neisseria gonorrhoeae Z017, External Run Control - Low - 6 X 1 mL PRODUCT DESCRIPTION:  NATtrol™ Neisseria gonorrhoeae External Run Controls (NATNG-ERCL and NATNG-ERCM)* are formulated with purified, intact bacterial cells that have...
    NATNG-ERCL
    Select Currency //574.00
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  • NATtrol Neisseria gonorrhoeae Positive Control Pack

    NATtrol Neisseria gonorrhoeae Positive Control Pack

    Select Currency //600.00
    NATtrol Neisseria gonorrhoeae Positive Control Pack - 6 X 1.25 mL INTENDED USE: NATtrol™ Neisseria gonorrhoeae (NG) Positive Controls (MDZ003) consist of in vitro diagnostic external run controls intended for use with qualitative molecular assays...
    MDZ003 --- NATNG-6MC-IVD
    Select Currency //600.00
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  • NATtrol Neisseria gonorrhoeae Positive Control

    NATtrol Neisseria gonorrhoeae Positive Control

    Select Currency //563.00
    NATtrol Neisseria gonorrhoeae Positive Control - 6 X 1 mL INTENDED USE: NATtrol™ CT/NG External Run Controls are qualitative in vitro diagnostic external run controls intended to be used with molecular assays. SUMMARY AND EXPLANATION: NATtrolTM...
    NATNG-6MC
    Select Currency //563.00
    Qty in Cart: 0
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  • NATtrol MRSA/SA Panel

    NATtrol MRSA/SA Panel

    Select Currency //566.00
    NATtrol MRSA/SA Panel - 5 X 0.5 mL  
    NATMRSA/SAP-C
    Select Currency //566.00
    Qty in Cart: 0
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  • NATtrol MRSA Verification Panel

    NATtrol MRSA Verification Panel

    Select Currency //630.00
    NATtrol MRSA Verification Panel - 6 X 0.5 mL  
    NATMRSANP-C
    Select Currency //630.00
    Qty in Cart: 0
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    Select Currency //630.00
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  • NATtrol MRSA Positive Control

    NATtrol MRSA Positive Control

    Select Currency //539.00
      NATtrol™ MRSA/SA External Run Controls* are formulated with purified, intact bacterial cells. The cells have been chemically modified to render them non-infectious and refrigerator stable. Each control pack contains 6 X 0.5 mL of...
    MDZ059 --- NATMRSA-6MC-IVD
    Select Currency //539.00
    Qty in Cart: 0
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  • NATtrol MRSA Panel

    NATtrol MRSA Panel

    Select Currency //505.00
    NATtrol MRSA Panel - 4 X 0.5 mL
    NATMRSAP-C
    Select Currency //505.00
    Qty in Cart: 0
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  • NATtrol MERS-CoV Stock

    NATtrol MERS-CoV Stock

    Select Currency //801.00
    NATtrol MERS-CoV Stock- Qualitative 1 mL  
    NATMERS-ST
    Select Currency //801.00
    Qty in Cart: 0
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    Select Currency //801.00
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  • NATtrol Meningitis/Encephalitis Panel

    NATtrol Meningitis/Encephalitis Panel

    Select Currency //871.00
    NATtrol Meningitis/Encephalitis Panel- 14 x 0.4 mL
    NATMEP-BIO
    Select Currency //871.00
    Qty in Cart: 0
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    Select Currency //871.00
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  • NATtrol Meningitis/Encephalitis

    NATtrol Meningitis/Encephalitis

    Select Currency //652.00
    NATtrol Meningitis/Encephalitis- ME Controls12 x 0.2 mL PRODUCT DESCRIPTION:  NATtrol™ Meningitis/Encephalitis (ME) Controls* (Qualitative) are formulated with purified, intact bacterial and fungal cells and viral particles. The microorganisms...
    NATMEC-BIO
    Select Currency //652.00
    Qty in Cart: 0
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    Select Currency //652.00
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  • NATtrol Influenza/RSV Verification Panel

    NATtrol Influenza/RSV Verification Panel

    Select Currency //1,025.00
    NATtrol Influenza/RSV Verification Panel - 21 x 0.5mL  
    NATFRVP-C
    Select Currency //1,025.00
    Qty in Cart: 0
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    Select Currency //1,025.00
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  • NATtrol Influenza Verification Panel

    NATtrol Influenza Verification Panel

    Select Currency //900.00
    NATtrol Influenza Verification Panel - 18 x 0.5mL  
    NATFVP(XP)-C
    Select Currency //900.00
    Qty in Cart: 0
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  • NATtrol Influenza Negative Control

    NATtrol Influenza Negative Control

    Select Currency //453.00
    NATtrol Influenza Negative Control - 6 X 0.5 mL  
    NATCXVA9-6MC
    Select Currency //453.00
    Qty in Cart: 0
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    Select Currency //453.00
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  • NATtrol Influenza B, External Run Control, Medium

    NATtrol Influenza B, External Run Control, Medium

    Select Currency //644.00
    NATtrol Influenza B, External Run Control - Medium - 6 X 1 mL  
    NATFLUB-ERCM
    Select Currency //644.00
    Qty in Cart: 0
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  • NATtrol Influenza B Virus Stock

    NATtrol Influenza B Virus Stock

    Select Currency //1,403.00
    NATtrol Influenza B Virus Stock - Qualitative1 mL  
    NATFLUB-ST
    Select Currency //1,403.00
    Qty in Cart: 0
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  • NATtrol Influenza B Stock

    NATtrol Influenza B Stock

    Select Currency //1,021.00
    NATtrol™ Influenza B Stock* is formulated with purified, intact viral particles that have been chemically modified to render them non-infectious and refrigerator stable. Each vial contains 1.0 mL of NATtrol™ Influenza B stock in a proprietary...
    NATFLUB-STQ
    Select Currency //1,021.00
    Qty in Cart: 0
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    Select Currency //1,021.00
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  • NATtrol Influenza AH3 Stock

    NATtrol Influenza AH3 Stock

    Select Currency //1,021.00
    NATtrol™ Influenza AH3 Stock* is formulated with purified, intact viral particles that have been chemically modified to render them non-infectious and refrigerator stable. Each vial contains 1.0 mL of NATtrol™ Influenza AH3 stock in a...
    NATFLUAH3-STQ
    Select Currency //1,021.00
    Qty in Cart: 0
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    Select Currency //1,021.00
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  • NATtrol Influenza A/B Positive Control NATtrol Influenza A/B Positive Control

    NATtrol Influenza A/B Positive Control

    Select Currency //448.00
    NATtrol Influenza A/B Positive Control - 6 x 0.5mL PRODUCT DESCRIPTION: NATtrol™ Influenza/RSV External Run Controls (NATFLUAB[1]6C, NATRSV-6C and NATCXVA9-6C)* are formulated with purified, intact virus particles that have been chemically...
    MDZ046 --- NATFLUAB-6C-IVD
    Select Currency //448.00
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  • NATtrol Influenza A H3 Virus Stock

    NATtrol Influenza A H3 Virus Stock

    Select Currency //1,403.00
    NATtrol Influenza A H3 Virus Stock - Qualitative 1 mL  
    NATFLUAH3-ST
    Select Currency //1,403.00
    Qty in Cart: 0
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  • NATtrol Influenza A H1N1pdm Stock | NATFLUAH1(2009)-STQ

    NATtrol Influenza A H1N1pdm Stock | NATFLUAH1(2009)-STQ

    Select Currency //1,021.00
    NATtrol Influenza A H1N1pdm Stock - Quantitative1 mL PRODUCT DESCRIPTION:NATtrol™ Influenza A H1N1pdm Stock* is formulated with purified, intact viral particles that have been chemically modified to render them non-infectious and refrigerator...
    NATFLUAH1(2009)-STQ
    Select Currency //1,021.00
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  • NATtrol Influenza A H1N1, External Run Control, Medium

    NATtrol Influenza A H1N1, External Run Control, Medium

    Select Currency //644.00
    NATtrol Influenza A H1N1, External Run Control - Medium - 6 X 1 mL  
    NATFLUAH1N1-ERCM
    Select Currency //644.00
    Qty in Cart: 0
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  • NATtrol Influenza A H1N1, External Run Control, Low

    NATtrol Influenza A H1N1, External Run Control, Low

    Select Currency //574.00
    NATtrol Influenza A H1N1, External Run Control - Low- 6 X 1 mL  
    NATFLUAH1N1-ERCL
    Select Currency //574.00
    Qty in Cart: 0
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    Select Currency //574.00
    Subtotal:
  • NATtrol Influenza A H1N1 Positive Control

    NATtrol Influenza A H1N1 Positive Control

    Select Currency //453.00
    NATtrol Influenza A H1N1 Positive Control - 6 X 0.5 mL  
    NATFLUAH1N1-6MC
    Select Currency //453.00
    Qty in Cart: 0
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    Select Currency //453.00
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  • NATtrol Influenza A H1, External Run Control, Medium

    NATtrol Influenza A H1, External Run Control, Medium

    Select Currency //644.00
    NATtrol Influenza A H1, External Run Control - Medium- 6 X 1 mL  
    NATFLUAH1-ERCM
    Select Currency //644.00
    Qty in Cart: 0
    Quantity:
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    Select Currency //644.00
    Subtotal:
  • NATtrol Influenza A H1, External Run Control, Low

    NATtrol Influenza A H1, External Run Control, Low

    Select Currency //574.00
    NATtrol Influenza A H1, External Run Control - Low - 6 X 1 mL  
    NATFLUAH1-ERCL
    Select Currency //574.00
    Qty in Cart: 0
    Quantity:
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    Subtotal:
  • NATtrol Influenza A H1 Virus Stock

    NATtrol Influenza A H1 Virus Stock

    Select Currency //1,403.00
    NATtrol Influenza A H1 Virus Stock - Qualitative 1 mL  
    NATFLUAH1-ST
    Select Currency //1,403.00
    Qty in Cart: 0
    Quantity:
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  • NATtrol Influenza A H1 Stock

    NATtrol Influenza A H1 Stock

    Select Currency //1,021.00
    NATtrol™ Influenza A H1 Stock* is formulated with purified, intact viral particles that have been chemically modified to render them non-infectious and refrigerator stable. Each vialcontains 1.0 mL of NATtrol™ Influenza A H1 stock in a...
    NATFLUAH1-STQ
    Select Currency //1,021.00
    Qty in Cart: 0
    Quantity:
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  • NATtrol HSV 1 & 2 Positive Control

    NATtrol HSV 1 & 2 Positive Control

    Select Currency //494.00
    NATtrol HSV 1 & 2 Positive Control - 6 x 0.25 mL PRODUCT DESCRIPTION:NATtrol™ HSV 1 & 2 Positive Control (NATHSV-6L)* is formulated with purified, intact viral particles that have been chemically modified to render them non-infectious and...
    NATHSV-6L
    Select Currency //494.00
    Qty in Cart: 0
    Quantity:
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  • NATtrol Group A Strep Positive Control

    NATtrol Group A Strep Positive Control

    Select Currency //488.00
    NATtrol Group A Strep Positive Control - 6 x 0.25 mL  
    NATSPY-6L
    Select Currency //488.00
    Qty in Cart: 0
    Quantity:
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  • NATtrol GI Controls

    NATtrol GI Controls

    Select Currency //688.00
    NATtrol™ GI Controls GI Controls (12 x 0.2 mL) #NATGIC-BIO BioFire™ FilmArray® GI Controls PRODUCT DESCRIPTION: NATtrol™ GI Controls (NATGIC-BIO)* are formulated with purified, intact virus partricles and bacterial cells that have...
    NATGIC-BIO
    Select Currency //688.00
    Qty in Cart: 0
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    Subtotal:
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