Activated thrombin cleaves the A chains of factor XIII tetramers in a reaction stimulated by the presence of fibrin multimers (Lewis et al. 1985). The amino terminal portions of the A chains are released as activation peptides, which have no known function. The resulting factor XIII tetramer remains catalytically inactive.
Lewis, SD, Janus, TJ, Lorand, L, Shafer, JA
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