“…Such non-specific tests as the clotting time or the prothrombin consumption test may be abnormal in any given subject because of quite irrelevant factors. Indeed, the converse is often true, namely, that these tests may give normal results in classic hemophiliacs (43)(44)(45)(46)(47)(48)(49)(50). However, any abnormality present in a hemophilic carrier might be manifested by a true decrease in the plasma's anti-hemophilic activity, were the defective gene "incompletely recessive.…”