Native Antigen

MOUSE ANTI-CANINE PARVOVIRUS 2 ANTIBODY (8H7) Mouse anti Canine Parvovirus 2 antibody (8H7) is a monoclonal antibody that is specific for CPV-2 capsid protein VP2 and binds Canine Parvovirus (CPV) in...

MOUSE ANTI-CANINE PARVOVIRUS 2 ANTIBODY (5G7) Mouse Anti Canine Parvovirus 2 Antibody (5G7) is a monoclonal antibody that is specific for CPV-2 capsid protein VP2 and binds Canine Parvovirus (CPV)...

MOUSE ANTI-CANINE PARVOVIRUS 2 ANTIBODY (3H6) Mouse anti Canine Parvovirus 2 antibody (3H6) is a monoclonal antibody that is specific for CPV-2 capsid protein VP2. The antibody binds Canine...

MOUSE ANTI-CANINE PARVOVIRUS 2 ANTIBODY (3G3) Mouse anti Canine Parvovirus 2 antibody (3G3) is a monoclonal antibody that is specific for CPV-2 capsid protein VP2. The antibody binds Canine...

MOUSE ANTI-CANINE PARVOVIRUS 2 ANTIBODY (2A10) Mouse anti Canine Parvovirus 2 antibody (2A10) is a monoclonal antibody that is specific for CPV-2 capsid protein VP2 and binds Canine Parvovirus (CPV)...

MOUSE ANTI-CANINE HEARTWORM ANTIBODY (3233) Mouse Anti Canine Heartworm Antibody (3233) reacts with Dirofilaria immitis. The antibody is suitable for enzyme immunoassay (EIA) applications (ELISA). ...

MOUSE ANTI-CANINE HEARTWORM ANTIBODY (3232) Mouse Anti Canine Heartworm Antibody (3232) reacts with Dirofilaria immitis. The antibody is suitable for enzyme immunoassay (EIA) applications (ELISA)...

MOUSE ANTI-CANINE HEARTWORM ANTIBODY (3231) Mouse Anti Canine Heartworm Antibody (3231) reacts with Dirofilaria immitis. The antibody is suitable for enzyme immunoassay (EIA) applications (ELISA)...

MOUSE ANTI-CANINE DISTEMPER VIRUS SURFACE ENVELOPE ANTIBODY (8-1) Mouse anti canine distemper virus surface envelope antibody (8-1) is a monoclonal antibody that is specific for canine distemper...

MOUSE ANTI-CANINE DISTEMPER VIRUS SURFACE ENVELOPE ANTIBODY (5-4) Mouse anti canine distemper virus surface envelope antibody (5-4) is a monoclonal antibody that is specific for canine distemper...

MOUSE ANTI-CANINE CORONAVIRUS NUCLEOPROTEIN ANTIBODY (M938) Mouse anti canine coronavirus Nucleoprotein antibody (M938) is a monoclonal antibody that is specific for canine coronavirus (CCoV)...

MOUSE ANTI-CANINE CORONAVIRUS NUCLEOPROTEIN ANTIBODY (M700) Mouse anti canine coronavirus Nucleoprotein antibody (M700) is a monoclonal antibody that is specific for canine coronavirus (CCoV)...

MOUSE ANTI-CAMPYLOBACTER JEJUNI ANTIBODY (CA30) Campylobacter jejuni antibody (clone CA30), is a mouse monoclonal antibody that is specific for the detection of Campylobacter jejuni. The antibody...

MOUSE ANTI-CAMPYLOBACTER JEJUNI ANTIBODY (CA29) Campylobacter jejuni antibody (clone CA29), is mouse monoclonal antibody that is specific for the detection of Campylobacter jejuni. The antibody does...

MOUSE ANTI-BURKHOLDERIA MALLEI ANTIBODY (SAP1-43) Mouse Anti Burkholderia mallei Antibody (Sap1-43) is a monoclonal antibody that is specific for whole cells of B. mallei.   PRODUCT DETAILS...

MOUSE ANTI-BOVINE CORONAVIRUS SPIKE ANTIBODY (5A4) Mouse anti bovine coronavirus Spike antibody is a monoclonal antibody, specific for the Spike (S) protein of bovine coronavirus (BCoV), for use in...

BORRELIA BURGDORFERI GARINII ANTIBODY (CLONE BG14) Borrelia burgdorferi garinii antibody (clone Bg14), is a mouse monoclonal recognising Borrelia burgdorferi garinii. The antibody is suitable for...

MOUSE ANTI-ASTROVIRUS ANTIBODY (AT54) Astrovirus antibody (clone AT54), a mouse monoclonal antibody that is specific for Astrovirus protein detection.The mouse anti Astrovirus antibody (clone AT54)...

ADENOVIRUS HEXON PROTEIN ANTIBODY (A15) Adenovirus hexon protein antibody (clone A15) is a mouse monoclonal antibody recognising the hexon protein of Adenovirus. Hexon protein is the largest and...

ADENOVIRUS HEXON PROTEIN ANTIBODY (A14) Adenovirus hexon protein antibody (clone A14), is a mouse monoclonal antibody that recognises the hexon protein of Adenovirus. Hexon protein is the largest...

MOUSE ANTI-SARS-COV-2 SPIKE (S2) ANTIBODY (JC7) Mouse anti SARS-CoV-2 Spike (S2) antibody (JC7) is a monoclonal antibody that recognizes the Spike subunit 2 (S2) glycoprotein of SARS-CoV-2, which is...

MOUSE ANTI-SARS-COV-2 SPIKE (S2) ANTIBODY (HA11) Mouse anti SARS-CoV-2 Spike (S2) antibody (HA11) is a monoclonal antibody that recognizes the Spike subunit 2 (S2) glycoprotein of SARS-CoV-2, which...

MOUSE ANTI-SARS-COV-2 SPIKE (S2) ANTIBODY (CH1) Mouse anti SARS-CoV-2 Spike (S2) antibody (CH1) is a monoclonal antibody that recognizes the Spike subunit 2 (S2) glycoprotein of SARS-CoV-2, which is...

MOUSE ANTI-SARS-COV-2 SPIKE (S2) ANTIBODY (AD10) Mouse anti SARS-CoV-2 Spike (S2) antibody (AD10) is a monoclonal antibody that recognizes the Spike subunit 2 (S2) glycoprotein of SARS-CoV-2, which...

MOUSE ANTI-SARS-COV-2 SPIKE (S1) RBD ANTIBODY (FG11) Mouse anti SARS-CoV-2 spike (S1) RBD antibody (FG11) is a monoclonal antibody that is specific for the spike receptor binding domain of SARS-CoV...

MOUSE ANTI-SARS-COV-2 SPIKE (S1) RBD ANTIBODY (DH6) Mouse anti SARS-CoV-2 spike (S1) RBD antibody (DH6) is a monoclonal antibody that is specific for the spike receptor binding domain of SARS-CoV-2,...

MOUSE ANTI-SARS-COV-2 SPIKE (S1) RBD ANTIBODY (CE5) Mouse anti SARS-CoV-2 spike (S1) RBD antibody (CE5) is a monoclonal antibody that is specific for the spike receptor binding domain of SARS-CoV-2,...

MOUSE ANTI-SARS-COV-2 SPIKE (S1) ANTIBODY (HH10) Mouse anti SARS-CoV-2 spike (S1) antibody (HH10) is a monoclonal antibody that is specific for the spike subunit 1 (S1) of SARS-CoV-2, the causative...

MOUSE ANTI-SARS-COV-2 SPIKE (S1) ANTIBODY (FH4) Mouse anti SARS-CoV-2 spike (S1) antibody (FH4) is a monoclonal antibody that is specific for the spike subunit 1 (S1) of SARS-CoV-2, the causative...

MOUSE ANTI-SARS-COV-2 SPIKE (S1) ANTIBODY (EB5) Mouse anti SARS-CoV-2 spike (S1) antibody (EB5) is a monoclonal antibody that is specific for the spike subunit 1 (S1) of SARS-CoV-2, the causative...

MOUSE ANTI SARS-COV-2 NUCLEOPROTEIN ANTIBODY (JF1) Mouse anti SARS-CoV-2 nucleoprotein (JF1) antibody recognizes the nucleocapsid protein of SARS-CoV-2 (COVID-19) by ELISA. Antibody does not...

MOUSE ANTI SARS-COV-2 NUCLEOPROTEIN ANTIBODY (JB8) Mouse anti SARS-CoV-2 nucleoprotein (JB8) antibody recognizes the nucleocapsid protein of SARS-CoV-2 (COVID-19) by ELISA. SARS-CoV-2, previously...

MOUSE ANTI SARS-COV-2 NUCLEOPROTEIN ANTIBODY (JA6) Mouse anti SARS-CoV-2 nucleoprotein (JA6) antibody recognizes the nucleocapsid protein of SARS-CoV-2 (COVID-19) by ELISA. Antibody can be used as a...

MOUSE ANTI SARS-COV-2 NUCLEOPROTEIN ANTIBODY (GC12) Anti SARS-CoV-2 nucleoprotein (GC12) antibody recognizes the nucleocapsid protein of SARS-CoV-2 (COVID-19) by ELISA. Antibody can be used as a...

MOUSE ANTI CRYPTOSPORIDIUM ANTIBODY (1D10) Mouse anti Cryptosporidium antibody (1D10) is specific for a carbohydrate on the surface of Cryptosporidium parvum oocysts. It reacts with oocysts from all...

MERS-COV SPIKE GLYCOPROTEIN (S1), HIS-TAG (INSECT CELLS) MERS-COV Spike Glycoprotein (S1) is a recombinant Middle Eastern Respiratory Syndrome (MERS) coronavirus (CoV) Spike subunit 1 protein (S1),...

MERS CORONAVIRUS SPIKE GLYCOPROTEIN (S1), HIS-TAG MERS Coronavirus Spike Glycoprotein (S1), His-Tag is a recombinant protein, cloned and expressed in E. coli with greater than 95% purity.   ...

MERS CORONAVIRUS SPIKE GLYCOPROTEIN (S1) MERS Coronavirus Spike (S1), a recombinant protein with N-terminal camel Fc-tag, manufactured in mammalian HEK293 cells.   PRODUCT DETAILS – MERS...

MEASLES VIRUS NUCLEOPROTEIN (HEK293) Measles virus (Rubeola) recombinant nucleoprotein antigen is manufactured in mammalian HEK293 cells for use in diagnostics research and vaccine development...

MEASLES VIRUS LYSATE Measles virus lysate has been manufactured to provide a consistent source of native Measles virus antigen. This material has been produced by culturing Measles virus in the Vero...

MEASLES VIRUS IGM ELISA Enzyme immunoassay for the qualitative determination of IgM class antibodies against Measles Virus in human serum or plasma (citrate, heparin). The qualitative immunoenzymatic...

MEASLES VIRUS IGG ELISA Enzyme immunoassay for the qualitative determination of IgG class antibodies against Measles virus in human serum or plasma. The qualitative immunoenzymatic determination of...

MEASLES VIRUS IGG AVIDITY ELISA The Avidity Measles Virus IgG ELISA is intended to indicate the Measles-specific IgG avidity in human serum or plasma (citrate, heparin) to differentiate between...

MAYARO VIRUS VLP At The Native Antigen Company we have prepared recombinant Mayaro Virus VLP utilising our proprietary mammalian cell expression system. These particles contain Capsid and E1 and E2...

MAYARO VIRUS E2 ENVELOPE PROTEIN – MOUSE FC-TAG Mayaro Virus E2 protein is a unique product that has been developed in response to the need for high purity, properly assembled and glycosylated...

MAYARO VIRUS E2 ENVELOPE PROTEIN – HUMAN FC-TAG Mayaro Virus E2 protein is a unique product that has been developed in response to the need for high purity, properly assembled and glycosylated...

MAYARO VIRUS E2 ENVELOPE PROTEIN Mayaro Virus E2 protein is a unique product that has been developed in response to the need for high purity, properly assembled and glycosylated Mayaro virus...

MARBURG VIRUS ENVELOPE GLYCOPROTEIN (GP), SHEEP FC-TAG (HEK293) Marburg virus envelope glycoprotein (GP) is a recombinant MARV protein expressed and purified from mammalian cells. The product...

MALARIA IgG/IgM ELISA This Malaria IgG/IgM ELISA is intended for the qualitative determination of IgG/IgM antibodies against Plasmodium in human serum or plasma. The qualitative immunoenzymatic...

LEPTOSPIRA BIFLEXA ANTIGEN (STRAIN PATOC 1) Leptospira biflexa antigen (strain Patoc 1) is a non-pathogenic organism, which can be used as a prototype antigen for the development and manufacturing of...

LEGIOTAG LEGIONELLA PNEUMOPHILA SPECIFIC LABEL Functional tools such as chemical reporters are very useful to help understand complex biological systems. They can be used in conjunction with...

LEGIONELLA PNEUMOPHILA IgM ELISA Legionella pneumophila IgM ELISA for the qualitative determination of IgM class antibodies against Legionella pneumophila in human serum or plasma (citrate, heparin)...

LEGIONELLA PNEUMOPHILA IgG ELISA Legionella pneumophila IgG ELISA for the qualitative determination of IgG class antibodies against Legionella pneumophila in human serum or plasma (citrate, heparin)...

LEGIONELLA PNEUMOPHILA ANTIGEN, NATIVE EXTRACT This product is a native extract of inactivated Legionella pneumophila antigen taken from culture.   PRODUCT DETAILS – LEGIONELLA PNEUMOPHILA...

LASSA FEVER VIRUS GP2 PROTEIN This Lassa fever Virus GP2 recombinant protein contains a Sheep Fc tag, and is expressed in HEK293 cells. The purified protein is designed for use in research and...

LASSA FEVER VIRUS GP2 PROTEIN, MOUSE FC-TAG This Lassa fever Virus GP2 recombinant protein contains a Mouse Fc tag, and is expressed in HEK293 cells. The purified protein is designed for use in...

LASSA FEVER VIRUS GP2 PROTEIN, HUMAN FC-TAG This Lassa fever Virus GP2 recombinant protein contains a Human Fc tag, and is expressed in HEK293 cells. The purified protein is designed for use in...

LASSA FEVER VIRUS GP1 PROTEIN This Lassa Fever Virus GP1 Protein (Sheep Fc) is a recombinant protein expressed in HEK293 cells. The purified protein is designed for use in research and development of...

LASSA FEVER VIRUS GP1 PROTEIN, MOUSE FC-TAG This Lassa Fever virus GP1 recombinant protein contains a Mouse Fc tag, and is expressed in HEK293 cells. The purified protein is designed for use in...

LASSA FEVER VIRUS GP1 PROTEIN, HUMAN FC-TAG This Lassa fever Virus GP1 recombinant protein contains a Human Fc tag, and is expressed in HEK293 cells. The purified protein is designed for use in...

JAPANESE ENCEPHALITIS VIRUS VLP Recombinant Japanese encephalitis VLP (virus-like particles) produced in HEK293 cells and purified from culture supernatant.   PRODUCT DETAILS – JAPANESE...

JAPANESE ENCEPHALITIS VIRUS VACCINE SERUM: PRE-VACCINATION BLEED We are pleased to make available a liquid preparation of serum obtained from a recipient of Japanese Encephalitis vaccine, prior to...

JAPANESE ENCEPHALITIS VIRUS VACCINE SERUM: 6 MONTH IGG BLEED We are pleased to make available a liquid preparation of Japanese Encephalitis virus (JEV) vaccine IgG serum obtained from a...

JAPANESE ENCEPHALITIS VIRUS NS1 PROTEIN Japanese Encephalitis Virus NS1 protein is produced entirely from human cell lines using state-of-the-art expression techniques, the same approach which NAC...

JAPANESE ENCEPHALITIS VIRUS ENVELOPE PROTEIN Recombinant JEV Envelope protein produced in HEK293 cells and purified from culture supernatant. Protein contains a C-terminal 6x His-tag. The NAC...

INFLUENZA B [B/WASHINGTON/02/2019] NEURAMINIDASE (NA), HIS-TAG This Influenza virus neuraminidase protein is derived from the NA sequence of B/Washington/02/2019, expressing aa 44-466, and fused with...

INFLUENZA B [B/WASHINGTON/02/2019] HEMAGGLUTININ (HA), HIS-TAG This Influenza virus hemagglutinin protein is derived from the HA sequence of B/Washington/02/2019, expressing aa 1-545, and fused with...

INFLUENZA B [B/WASHINGTON/02/2019 (B/VICTORIA LINEAGE)-LIKE VIRUS] HEMAGGLUTININ (HA), HIS-TAG This Influenza virus hemagglutinin protein is derived from the HA sequence of the B/Washington/02/2019...

INFLUENZA B [B/VICTORIA/35/2013] NEURAMINIDASE (NA), HIS-TAG This Influenza virus neuraminidase protein is derived from the NA sequence of B/Victoria/35/2013, expressing aa 44-466, and fused with a...

INFLUENZA B [B/PHUKET/3073/2013 (B/YAMAGATA LINEAGE)-LIKE VIRUS] NEURAMINIDASE (NA), HIS-TAG This Influenza virus neuraminidase protein is derived from the NA sequence of the B/Phuket/3073/2013...

INFLUENZA B [B/PHUKET/3073/2013 (B/YAMAGATA LINEAGE)-LIKE VIRUS] HEMAGGLUTININ (HA), HIS-TAG This Influenza virus hemagglutinin protein is derived from the HA sequence of the B/Phuket/3073/2013...

INFLUENZA B [B/PALERMO/4/2013] HEMAGGLUTININ (HA), HIS-TAG This Influenza virus hemagglutinin protein is derived from the HA sequence of B/Palermo/4/2013, expressing aa 16-547, and fused with a...

INFLUENZA B (B/MASSACHUSETTS/2/12) VIRAL LYSATE Influenza B (B/Massachusetts/2/12) viral lysate is an enveloped virus with a diameter of 80-120 nm, and contains a single-stranded, segmented,...

INFLUENZA B (B/BEIJING/184/93) NUCLEOPROTEIN Influenza B [B/Beijing/184/93] nucleoprotein (NP) is a recombinant antigen expressed and purified from Escherichia coli.   PRODUCT DETAILS –...

INFLUENZA A H3N2 (A/HK/8/68) VIRAL LYSATE Influenza A H3N2 (A/HK/8/68) virus is an enveloped virus with a diameter of 80-120 nm, and contains a single-stranded, segmented, negative-sense RNA within a...

INFLUENZA A H1N1PDM (A/CALIFORNIA/07/09) VIRAL LYSATE Influenza A H1N1pdm (A/California/07/09) Pandemic 2009 (H1N1pdm) virus is an enveloped virus with a diameter of 80-120 nm, and contains a...

INFLUENZA A H1N1 (A/NEW CAL/20/99) VIRAL LYSATE Influenza A H1N1 (A/New Cal/20/99) is an enveloped virus with a diameter of 80-120 nm, and contains a single-stranded, segmented, negative-sense RNA...

INFLUENZA A [A/VICTORIA/2570/2019 (H1N1)PDM09-LIKE VIRUS] NEURAMINIDASE (NA), HIS-TAG This Influenza virus neuraminidase protein is derived from the NA sequence of the A/Victoria/2570/2019...

INFLUENZA A [A/VICTORIA/2570/2019 (H1N1)PDM09-LIKE VIRUS] HEMAGGLUTININ (HA), HIS-TAG This Influenza virus hemagglutinin protein is derived from the HA sequence of the A/Victoria/2570/2019...

INFLUENZA A [A/THAILAND/1(KAN-1)/2004 (H5N1)] NEURAMINIDASE (NA), HIS-TAG This Influenza virus neuraminidase protein is derived from the NA sequence of the A/Thailand/1(KAN-1)/2004 (H5N1) strain,...

INFLUENZA A [A/SWINE/SHANDONG/1207/2016] NEURAMINIDASE (NA), HIS-TAG This Influenza virus neuraminidase protein is derived from the NA sequence of the A/swine/Shandong/1207/2016, expressing aa...

INFLUENZA A [A/SWINE/SHANDONG/1207/2016] HEMAGGLUTININ (HA), HIS-TAG This Influenza virus hemagglutinin protein is derived from the HA sequence of A/swine/Shandong/1207/2016, expressing aa 18-529,...

INFLUENZA A [A/SHANGHAI/2/2013(H7N9)] HEMAGGLUTININ (HA), HIS-TAG This Influenza virus hemagglutinin protein is derived from the HA sequence of the A/Shanghai/2/2013 (H7N9) strain, expressing Asp19-...

INFLUENZA A [A/SHANGHAI/2/2013(H7N9)] HEMAGGLUTININ (HA), FC-TAG Influenza, commonly known as “the flu”, is an infectious disease of birds and mammals caused by RNA viruses of the family...

INFLUENZA A [A/PUERTO RICO/8/1934 (H1N1)] HEMAGGLUTININ (HA), HIS-TAG This Influenza virus hemagglutinin protein is derived from the HA sequence of the A/Puerto Rico/8/1934 (H1N1) strain (Accession...

INFLUENZA A [A/OHIO/2017] NEURAMINIDASE (NA), HIS-TAG Influenza A (A/Ohio/2017) Neuraminidase is derived from the NA sequence of the IAV [A/swine/Ohio/17TOSU5163/2017], expressing aa 34-469, and...

INFLUENZA A [A/HONG KONG/483/97 (H5N1)] HEMAGGLUTININ (HA), HIS-TAG This Influenza virus hemagglutinin protein is derived from the HA sequence of the A/Hong Kong/483/97 (H5N1) strain (Accession #...

INFLUENZA A [A/Hong Kong/45/2019 (H3N2)] NEURAMINIDASE (NA), HIS-TAG This Influenza virus neuraminidase protein is derived from the NA sequence of the A/Hong Kong/45/2019 (H3N2), expressing aa...

INFLUENZA A [A/HONG KONG/45/2019 (H3N2)] HEMAGGLUTININ (HA), HIS-TAG This Influenza virus hemagglutinin protein is derived from the HA sequence of the A/Hong Kong/45/2019 (H3N2) virus, expressing aa...

INFLUENZA A (A/HONG KONG/1/1968 (H3N2)] NUCLEOPROTEIN Influenza A [A/Hong Kong/1/1968 (H3N2)] nucleoprotein (NP) is a recombinant antigen expressed and purified from Escherichia coli.   PRODUCT...

INFLUENZA A [A/HAWAII/70/2019 (H1N1)PDM09-LIKE VIRUS] NEURAMINIDASE (NA), HIS-TAG This Influenza virus neuraminidase protein is derived from the NA sequence of the A/Hawaii/70/2019 (H1N1)pdm09-like...

INFLUENZA A [A/HAWAII/70/2019 (H1N1)PDM09-LIKE VIRUS] HEMAGGLUTININ (HA), HIS-TAG This Influenza virus hemagglutinin protein is derived from the HA sequence of the A/Hawaii/70/2019 (H1N1)pdm09-like...

INFLUENZA A [A/GUINEA FOWL/HONG KONG/WF10/99 (H9N2)] HEMAGGLUTININ 1 (HA1), HIS-TAG This Influenza virus hemagglutinin 1 protein is derived from the HA sequence of the A/Guinea fowl/Hong...

INFLUENZA A [A/GUINEA FOWL/HONG KONG/WF10/99(H9N2)] HEMAGGLUTININ (HA), HIS-TAG This Influenza virus hemagglutinin protein is derived from the HA sequence of the A/Guinea fowl/Hong Kong/WF10/99,...

INFLUENZA A [A/CAMBODIA/E0826360/2020 (H3N2)-LIKE VIRUS] NEURAMINIDASE (NA), HIS-TAG This Influenza virus neuraminidase protein is derived from the NA sequence of the Cambodia/e0826360/2020...

INFLUENZA A [A/CAMBODIA/E0826360/2020 (H3N2)-LIKE VIRUS] HEMAGGLUTININ (HA), HIS-TAG This Influenza virus hemagglutinin protein is derived from the HA sequence of the Cambodia/e0826360/2020...

HUMAN T-CELL LYMPHOPTROPIC VIRUS TYPE 2 (HTLV-2) ENVELOPE PROTEIN, SHEEP FC-TAG (HEK293) Recombinant human T-cell lymphotropic virus type 2 (HTLV-2) envelope protein. The protein was produced in...

HUMAN T-CELL LYMPHOPTROPIC VIRUS TYPE 1 (HTLV-1) ENVELOPE PROTEIN, SHEEP FC-TAG (HEK293) Recombinant human T-cell lymphotropic virus type 1 (HTLV-1) envelope protein. The protein was produced in...

HUMAN PARAINFLUENZA VIRUS TYPE 4A LYSATE Human Parainfluenza Virus Type 4A is purified from LLC-mk2 cells using sucrose density gradient ultracentrifugation, disrupted in the presence of ...

HUMAN PARAINFLUENZA VIRUS TYPE 3 LYSATE Human Parainfluenza Virus Type 3 is purified from LLC-mk2 cells using sucrose density gradient ultracentrifugation, disrupted in the presence of ...