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Competitive-inhibition IgG ELISAs demonstrate antigenic specificity of a pooled standard human reference serum (SHRS III) in GBS III ELISA using either III-HSA (left panel) or IIIPS + mHSA (right panel) as the coating antigen. The percent inhibition of binding of the IIIPS antibodies in SHRS III was determined by comparison of the A405/630 in the presence and absence of inhibitors as indicated. ATTC, American Type Culture Collection.
