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Pronunciation: tran-si'shun


  1. Passage from one condition or one part to another.
  2. In polynucleic acid, replacement of a purine base by another purine base or a pyrimidine base by a different pyrimidine.

[L. transitio, fr. transeo, pp. -itus, to go across]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.