factor IXa activation of factor IX (TF:F7a catalyst) Authored: D'Eustachio, P, 2004-08-24 14:00:00 EC Number: 3.4.21 Factor VIIa, bound to tissue factor at the endothelial cell surface, catalyzes the formation of activated factor IX with high efficiency. The amino terminal part of the heavy chain of factor IX, the factor IX activation peptide, is released. (This peptide has no known function.) Pubmed2040636 Pubmed2248955 Reactome Database ID Release 43140823 Reactome, http://www.reactome.org ReactomeREACT_158 factor IX -> factor IXa + factor IX activation peptide (TF:F7a catalyst)