Recombinant Protein A and G

Protein A and Protein G are used extensively for the isolation of IgG from several species of mammals. The affinity of Protein A and Protein G to IgG's is different between species and IgG subclasses within a given species. Protein A and Protein G are popular choices for both antibodies binding in various assays and when coupled to beads, for Immunoprecipitation of antibody antigen complexes.