Anti-haemoglobin S antibodies were raised in horses and purified by affinity chromatography. These antibodies recognize beta6 valine, while they fail to bind to haemoglobins with a glutamy1 (Hb A) or a lysy1 (Hb C) residue in this position. The purified anti-Hb S antibodies were composed of equine IgG(a, b) and IgG(T) subclasses and failed to cause precipitation with Hb S, evidently because of the bivalencey of both antibodies and antigen.
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