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Factor XIIa

Activated form of factor XII. In the initial event in the intrinsic pathway of blood coagulation, kallikrein (with cofactor HIGH MOLECULAR WEIGHT KININOGEN) cleaves factor XII to XIIa. Factor XIIa is then further cleaved by kallikrein, plasmin, and trypsin to yield smaller factor XII fragments (Hageman-Factor fragments). These fragments increase the activity of prekallikrein to kallikrein but decrease the procoagulant activity of factor XII.

Year introduced: 1990

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Subheadings:

Tree Number(s): D08.811.277.656.300.760.324, D08.811.277.656.959.350.324, D12.776.124.125.450.324, D23.119.450.324

MeSH Unique ID: D015956

Registry Number: EC 3.4.21.38

Entry Terms:

  • Activated Factor XII
  • Factor XII, Activated
  • Coagulation Factor XIIa
  • Factor XIIa, Coagulation
  • Blood Coagulation Factor XII, Activated
  • Prekallikrein Activator
  • Activator, Prekallikrein
  • Factor Twelve A
  • Factor 12A
  • Hageman-Factor Fragments
  • Fragments, Hageman-Factor
  • Hageman Factor Fragments

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