Histidine (symbol His or H) is an essential amino acid that is used in the biosynthesis of proteins. It contains an α-amino group (which is in the protonated...

formed by a coupling reaction. Pauly, H (1904), "Über die Konstitution des Histidins. I. Mitteilung", Z. Physiol. Chem., 42 (5–6): 508–518, doi:10.1515/bchm2...

Abkömmlinge d. Imidazols u. d. Histidins. Vol. 43. pp. 2243–61. H. Pauly (1910). Über einige Verbindungen d. Histidins. Vol. 64. pp. 75–81. H. Pauly;...