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  This article was the subject of a Wiki Education Foundation-supported course assignment, between 28 August 2018 and 21 December 2018. Further details are available on the course page. Peer reviewers: Jashleenval.

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Wiki Education Foundation-supported course assignment

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  This article was the subject of a Wiki Education Foundation-supported course assignment, between 28 January 2019 and 15 May 2019. Further details are available on the course page. Student editor(s): Tracykong1128, Jackyye46.

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Wiki Education Foundation-supported course assignment

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  This article was the subject of a Wiki Education Foundation-supported course assignment, between 27 January 2020 and 8 May 2020. Further details are available on the course page. Student editor(s): Nsalganik1.

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Untitled

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Why histidine usually is not included in the aromatic aminoacids group?

Good question. No idea myself. Lehninger does not list it, but Voet does AFAIK. 84.112.136.52 (talk) 21:12, 9 February 2014 (UTC)Reply

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Pictures

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Right now non-canonical aminoacids are also listed. Can we use different border-colours for these to make it easier to distinguish them quickly? 84.112.136.52 (talk) 21:12, 9 February 2014 (UTC)Reply

Histidine

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Colleagues, histidine should be aromatic. It obeys aromaticity rules, exhibits aromatic properties and, no surprise, is aromatic. The reason above why Lehninger did not count it as aromatic is kinda tradition - aromatic aa supposed to have a moderate absorption at 260-300 nm region. It is pretty trivial and has nothing to do with chemistry.