Term: histidine (His Η)
Literally meaning: “of or pertaining to tissue”
Origin: Anc Greek
ιστός / histos(=warp, web) > ίστημι/istimi(=to stand, to inhibit)
In 1896 German biochemist Ludwig Karl Martin Leonard Albrecht Αlbrecht Kossel(1853-1927) discovered and named histidine as it was initially thought that it was essential for tissue function especially in infants.
Histidine is an essential amino acid and precursor for neurotransmitter histamine which is involved in immune responses.