1) Constituent of many proteins 2) Essential amino acid 3) Essential amino acid
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Histidine (abbreviated as His or H) is an α-amino acid with an imidazole functional group. It is one of the 23 proteinogenic amino acids. Its codons are CAU and CAC. Histidine was first isolated by German physician Albrecht Kossel in 1896. Histidine is an essential amino acid in humans and other mammals. It was initially thought that it was only ...
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http://en.wikipedia.org/wiki/Histidine
an amino acid obtainable by hydrolysis of many proteins. A particularly rich source, hemoglobin (the oxygen-carrying pigment of red blood cells) ... [4 related articles]
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http://www.britannica.com/eb/a-z/h/54
NH2CH(C4H5N2)COOH Molar mass: 155.15456
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http://www.convertunits.com/molarmass/Histidine
<amino acid> An amino acid with an imidazole side chain with a pKa of 6-7. Acts as a proton donor or acceptor and has high potential reactivity and diversity of chemical function. Forms part of the catalytic site of many enzymes. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973
(his´tĭ-dēn) a naturally occurring essential amino acid that is necessary for optimal growth of infants; its decarboxylation results in formation of histamine.
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http://www.encyclo.co.uk/local/21001
(= His; H; 155D) An amino acid with an imidazole side chain with a pKa of 6-7. Acts as a proton donor or acceptor and has high potential reactivity and diversity of chemical function. Forms part of the catalytic site of many enzymes. See Table A2.
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(H, His) Type: Term Pronunciation: his′ti-dēn Definitions: 1. the l-isomer is a basic amino acid found in most proteins. It is a nutritionally essential amino acid in mammals.
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http://www.medilexicon.com/medicaldictionary.php?t=41096
Histidine: An amino acid, one of the 20 building blocks of protein. An essential amino acid, histidine is present in many proteins. Histidine is elevated in the blood and urine in a genetic condition called histidinemia. Decarboxylation of histidine results in the formation of histamine. Symbol: His.
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http://www.medterms.com/script/main/art.asp?articlekey=22827
[
n] - an essential amino acid found in proteins that is important for the growth and repair of tissue
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http://www.webdictionary.co.uk/definition.php?query=histidine
histidine 1. An essential amino acid found in proteins that is important for the growth and repair of tissue. 2. An amino acid involved in the repair of tissues that is also the precursor of histamine.
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an essential amino acid, CHNCHCH(NH)COOH, that is a constituent of proteins and is important as the iron-binding site in hemoglobin.
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https://www.infoplease.com/dictionary/histidine
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