1N2‐histidino; the alkylamino group, (C3H3N2)CH2−CH(COOH)−NH−, derived from histidine by loss of a hydrogen atom from its α‐amino group.
2 either of the two possible groups, NΠ‐histidino or Nτ‐histidino, HOOC−CH(NH2)−CH2 ...
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