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SUMMARY A monospecific serum which recognizes antigen HL-A2 (Mac) of the HL-A system was systematically absorbed with homogenates of fresh organs of three individuals possessing this antigen. Spleen was shown to be the richest in this antigen, followed in order by lung, liver, intestine, kidney, and heart. Aorta is rather poor while fat and brain contain practically none.
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Berah et al. (1970) studied this question.
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