Characterization of two forms of human factor Va with different cofactor activities.


Factor Va is an essential cofactor in factor Xa-catalyzed prothrombin activation. Purified human factor Va appears to consist of a heavy chain (M(r) approximately 105,000) and a light chain doublet with M(r) approximately 74,000 and approximately 71,000. We separated factor Va by chromatography on a Mono-S column into two fractions, designated factors Va1… (More)

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