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Medical Term:


Pronunciation: ret'i-nal


  1. Relating to the retina.
  2. Retinaldehyde, most commonly referring to the all-trans form; participates in the visual process; 11-cis-retinal binds with an opsin to form iodopsin or rhodopsin; light causes the formation of all-trans-retinal, which dissociates from the protein.
© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.