FAQs

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.

Answers to the most common questions about ADA and PK ELISA assay development for GLP-1 receptor agonists — reagent cross-reactivity, neutralizing antibody testing, cut point setup, and BSA conjugate usage.

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.

Step-by-step protocol for refolding recombinant proteins from E. coli inclusion bodies. Covers solubilization (urea vs GdnHCl), refolding methods (dilution, dialysis, on-column), buffer optimization, L-arginine, redox pairs, and troubleshooting aggregation. 11,900+ ready-made E. coli proteins available.

Step-by-step Co-IP protocol for detecting protein-protein interactions, with troubleshooting for high background, weak signal, and IgG chain masking. Includes IP-validated antibody recommendations.

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).