Talk:Protein
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There are more than 20 amino acids that occur naturally. Selenocysteine is recognized as the 21st. http://www.ncbi.nlm.nih.gov/pubmed/8811175 It's a minor point, but I'm going to change the page to say "over 20," in case there are more than 21. Mcnamara12 (talk) 16:47, 8 March 2013 (UTC)