Primary antibodies
Primary antibodies are immunoglobulins that bind directly to antigens with high specificity and high affinity. Primary antibodies can be conjugated to reporter enzymes or fluorophores, or combined with secondary antibodies to detect, purify or measure biomolecules of interest. Common laboratory applications of antibodies include western blot, immunohistochemistry, immunoprecipitation, flow cytometry and ELISA.
We offer over 75,000 unconjugated and directly conjugated primary antibodies directed against more than 14,000 targets. Our catalog of primary antibodies includes over 24,000 monoclonal and recombinant antibodies for high batch-to-batch reliability and known antigenic specificity for reproducible results. We also provide custom antibody production services.
Featured primary antibody categories
Recombinant antibodies
Monoclonal antibodies made with recombinant DNA in an expression system. Highly pure and consistent.
Monoclonal antibodies
Antibodies that bind to a single known epitope for high reproducibility.
Multiclonal antibodies
Mixtures of multiple monoclonal antibodies for binding to multiple, known epitopes.
Polyclonal antibodies
Antibodies from a variety of host species that recognize multiple epitopes.
Biosimilar antibodies
Research-use monoclonal antibodies with the same amino acid sequence as therapeutic antibodies.
Carrier-free antibodies
Antibodies lacking additives that might otherwise interfere with live-cell experiments or conjugations.
Conjugated antibodies
Antibodies already conjugated to fluorophores or enzymes to eliminate the need for secondary antibodies.
Knockout validated
Highly validated antibodies that have had their specificity confirmed by knockout validation.
Primaries by applications
Cell marker antibodies
Resources
Product validation
Learn how we validate our antibodies.
Epitope tag antibodies
Detecting affinity tags, peptide tags, and fluorescent protein tags.
Biosimilar antibodies
What are research grade biosimilars and what can they be used for?
Recombinant antibodies
Learn how recombinant antibodies are made and what their advantages are.
Loading controls
Explore loading control antibodies by sample type and molecular weight.
Knockout validation
Learn about KO validation & discover KO validated antibodies for your research.
Isotype controls
Identify non-specific antibody binding and learn how you can reduce it.
Rabbit monoclonal antibodies
Highly specific and reproducible antibodies.
Antibody basics guide
Comprehensive guide introducing the essentials of antibodies.
Immune cell markers
Explore protein markers to distinguish between different immune cell types.
GPCR and phospho-GPCR antibodies
Learn how to optimize your protocols for the strongest signal.
Recent citations
Featured primary antibodies
Goat Anti-Rabbit IgG H&L Antibody (FITC), Cross
Recombinant mouse monoclonal antibody to Cytokeratin 18
Anti-Vimentin Antibody [VI-10] Cross-Adsorbed
Recombinant mouse monoclonal antibody to Cytokeratin 18
Anti-Human Nuclear Antigen Antibody
Recombinant mouse monoclonal antibody to Cytokeratin 18
