Primary Antibodies

How to Choose the Right Primary Antibody

Selecting the right primary antibody depends on your target protein, experimental application, and required specificity. Proteintech offers three types — polyclonal, monoclonal, and recombinant — each with distinct advantages depending on your research needs.

Polyclonal vs. Monoclonal vs. Recombinant

Polyclonal antibodies recognize multiple epitopes on a target protein, providing strong signal amplification. They are the best choice for detecting low-abundance proteins or targets in species with limited reagent availability. Because they bind multiple sites, polyclonals are more tolerant of minor protein modifications like point mutations or partial denaturation — making them reliable for Western blot and immunoprecipitation.

Monoclonal antibodies bind a single epitope with high specificity, producing clean results with low background. They are ideal for applications requiring precise discrimination between similar proteins, such as flow cytometry and immunohistochemistry. Monoclonals also provide consistent performance across lots, which matters for longitudinal studies.

Uni-rAb™ recombinant antibodies combine the specificity of monoclonals with guaranteed lot-to-lot consistency. Produced through Proteintech's ABCE™ cloning platform rather than traditional hybridomas, recombinant antibodies eliminate the risk of genetic drift that can cause performance changes between production batches. They are available in carrier-free PBS formulations for applications requiring conjugation or buffer flexibility.

Choosing by Application

Antibodies verified with KD/KO Validation

Every Proteintech primary antibody is tested in-house using positive and negative controls. Over 4,000 targets include KD/KO validation — confirmed using knockout or knockdown cell lines to prove the antibody binds only its intended target. Validation data, application-specific images, and recommended dilutions are published on every product page.

With 400,000+ independent citations across peer-reviewed publications, Proteintech antibodies are among the most-referenced reagents in life science research. Citation counts are listed on each product page so you can evaluate real-world performance before purchasing.