The 22nd Amino Acid

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Science  24 May 2002:
Vol. 296, Issue 5572, pp. 1409-1410
DOI: 10.1126/science.1073339

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In their Perspective, Atkins and Gesteland discuss the discovery of the 22nd amino acid, pyrrolysine, in Archaea ( Hao et al. , Srinivasan et al.).