File:Molecular structures of the 21 proteinogenic amino acids.svg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	23:48, 27 October 2015		612 × 792 (629 KB)	NefariousPhD	3. Corrected the Histidine structure (for info on why it's considered a positive ion despite a pKa of 6, see https://answers.yahoo.com/question/index?qid=20111016211715AAtgQtL ); it's also labeled as a positively-charged side chain, so that should also...

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Width	612px
Height	792px