Selenocysteine

Selenocysteine [1] is the 21st protein-building amino acid.[2] It is almost the same as cysteine, but a selenium atom replaces the sulfur atom.

References
  1. abbreviated as Sec or U; and in older publications as Se-Cys
  2. Stadtman, Therese 1974. Selenium biochemistry. Science. 183 (4128): 915–22. Archived 2016-12-22 at the Wayback Machine
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