plasma thromboplastin antecedent

noun
plasma thromboplastin an·te·ced·ent | \-ˌant-ə-ˈsēd-ᵊnt \

Medical Definition of plasma thromboplastin antecedent 

: a clotting factor whose absence is associated with a form of hemophilia abbreviation PTA

called also factor XI

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not any or not one

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