FAQ

How to choose between bridging, direct, and competitive ELISA formats for anti-drug antibody (ADA) detection. Complete guide with 60+ ready-to-use ADA, PK, and NAb ELISA kits covering 21 therapeutic antibody targets.

Complete immunoprecipitation protocol: Protein A vs G vs A/G bead selection by antibody isotype, agarose vs magnetic beads, antibody amount optimization, lysis buffer selection for Co-IP, acid vs SDS elution, and heavy chain contamination solutions. Nano-Trap kits for clean IP available.

Compare three IHC antigen retrieval methods: citrate buffer pH 6.0, EDTA/Tris-EDTA pH 9.0, and enzymatic digestion (Proteinase K, trypsin, pepsin). Includes target-based recommendation table for Ki-67, ER, PR, CD3, PD-L1, HER2, collagen IV, and more. Troubleshooting tips included.

Five strategies to validate antibody specificity: genetic (CRISPR KO, siRNA KD), orthogonal (RNA-seq, mass spec), independent antibody, peptide competition, and expression pattern. Includes minimum validation checklist for publication and application-specific tips for WB, IHC, IF, FC, IP, and ChIP.

Compare five antibody formats: full-length IgG, F(ab')2, Fab, scFv, and nanobody (VHH). Learn which format to use for WB, IHC, IP, super-resolution imaging, CAR-T, and in vivo studies. 810+ nanobodies, 160+ bispecific antibodies, and 22,000+ IgG antibodies available.

Compare four ELISA formats: direct, indirect, sandwich, and competitive. Learn when to use each format, with decision guide, practical tips for standard curves, blocking, and washing. 420+ ready-to-use ELISA kits for PK, ADA, NAb, and pathogen detection.

Complete guide to antibody structure — Fab and Fc regions, heavy and light chains, variable and constant domains, CDRs, hinge region, and the five immunoglobulin classes (IgG, IgM, IgA, IgD, IgE).

Phospho-antibody selection guide: 5 questions to answer before ordering (site number, species compatibility, WB/IHC/IF/flow validation, paired total protein, controls). Includes a quick-reference table of core phospho-sites across 7 signaling pathways.

Step-by-step phospho-WB protocol: phosphatase inhibitor formulations (NaF, Na₃VO₄, PhosSTOP), BSA vs milk blocking, probe phospho first then total, p/total ratio quantification, and a 6-problem troubleshooting table. Printable checklist included.

Learn when isotype controls are needed for flow cytometry, IHC, in vivo, and ELISA. Compare FMO vs isotype controls and avoid the most common isotype control mistakes.