Protein G or immunoglobulin-binding protein G (ProG) is a cell surface protein from Streptococcal bacteria which binds Fab and Fc regions of immunoglobulins[1].
↑ Erntell M, Myhre EB, Sjobring U, Bjorck L. Streptococcal protein G has affinity for both Fab- and Fc-fragments of human IgG. Mol Immunol. 1988 Feb;25(2):121-6. PMID:3131664
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