History of Amino acid/Talk

	Revision 18 . . October 27, 2001 2:09 pm by Josh Grosse
	Revision 17 . . October 27, 2001 1:56 pm by (logged).109.250.xxx [questions about amino acids other than standard 20]

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*How many naturally occuring amino acids are known, across all species, other than the standard 20, selenocysteine, ornithine and the D-forms of those? The article mentions that beta forms, but are there any other alpha forms? -- SJK

*How many naturally occuring amino acids are known, across all species, other than the standard 20, selenocysteine, ornithine and the D-forms of those? The article mentions that beta forms, but are there any other alpha forms? -- SJK The genetic code using pretty much the same amino acids in all living things. If you want to go beyond them, you get a whole slough of different compounds, including a variety in humans and a variety in other living things, most of which are different alpha-forms, often slight modifications of the standard 20 (cystine, selenocysteine, hydroxyproline, etc). I'm afraid it would be vain to try and enumerate them all, or even to give a representative list without a biochem text handy, as there is a whole slough of them.