Preguntas Frecuentes

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).

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.

Learn what Fc-tagged proteins are, why they are used, and when to choose Fc vs His tag. Covers purification, receptor binding assays, ADCC, in vivo PK studies, and common pitfalls.

Compare polyclonal, hybridoma monoclonal, and recombinant monoclonal antibodies across 8+ applications. Decision matrix for WB, IHC, flow cytometry, ELISA, IP, and in vivo use.

Compare hybridoma monoclonal and recombinant monoclonal antibodies for IHC. Learn why rabbit recombinants often outperform on FFPE tissue and when to stick with established clones.

Solve common multiplex immunoassay problems: analyte cross-reactivity, hook effect, matrix interference, spectral bleed, and poor inter-plate reproducibility.

Understand why lot-to-lot variation occurs in polyclonal, hybridoma monoclonal, and recombinant antibodies. Learn strategies to protect your experiments from inconsistent antibody lots.