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Factor XIa

Activated form of factor XI. In the intrinsic pathway, Factor XI is activated to XIa by factor XIIa in the presence of cofactor HMWK; (HIGH MOLECULAR WEIGHT KININOGEN). Factor XIa then activates factor IX to factor IXa in the presence of calcium.

Year introduced: 1990

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Tree Number(s): D08.811.277.656.300.760.320, D08.811.277.656.959.350.320, D12.776.124.125.425.320, D23.119.425.320

MeSH Unique ID: D015945

Registry Number: EC

Entry Terms:

  • Factor Eleven A
  • Activated Factor XI
  • Coagulation Factor XIa
  • Factor XIa, Coagulation
  • Blood Coagulation Factor XI, Activated
  • Contact Activation Product
  • Factor 11A
  • Factor XI, Activated

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