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A kinin is any of various structurally related polypeptides, such as bradykinin and kallikrein.[1] They are members of the autacoid family.[2]

They act locally to induce vasodilation and contraction of smooth muscle.[3][4]

It is a component of the kinin-kallikrein system.

Their precursors are kininogens.[5]

In botany, plant hormones cytokinins were first called kinins, but the name was changed to avoid confusion.[6]

Aspirin inhibits the activation of kallenogen by interfering with the formation of kallikrien enzyme which is essential in the process of activation.


  1. ^ Kinins. De Gruyter. 2011. ISBN 978-3-11-025235-4. 
  2. ^ Kinins at the US National Library of Medicine Medical Subject Headings (MeSH)
  3. ^ ‹The template EMedicineDictionary is being considered for deletion.› Kinin at eMedicine Dictionary
  4. ^ "Kinin" at Dorland's Medical Dictionary
  5. ^ Online Medical Dictionary
  6. ^ Galuszka P, Spíchal L, Kopečný D, Tarkowski P, Frébortová J, Šebela M and Frébort Ivo (2008) Metabolism of plant hormones cytokinins and their function in signaling, cell differentiation and plant development in Bioactive Natural Products Edt. Atta-ur-Rahman [1]

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