(¦prō·ak′sel·ə·rən)

(biochemistry) A labile procoagulant in normal plasma but deficient in the blood of patients with parahemophilia; essential for rapid conversion of prothrombin to thrombin. Also known as factor V; labile factor.

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n
labile factor, proaccelerin, accelerin, acceleration factor, cofactor of thromboplastin, component A of prothrombin, plasma acglobulin, plasma prothrombin conversion factor [PPCF], prothrombinase, prothrombin accelerator, prothrombin conversion accelerator I, thrombogen, thrombogene, proaccelerinac-celerin system

A factor apparently necessary for the formation of a prothrombin-converting substance in blood and tissue extracts—that is, intrinsic and extrinsic prothrombin activators. A deficiency results in parahemophilia (hypoproaccelerinemia).

(prō'ăk-sĕl'ər-ĭn)
n.

See factor V.