Definition of "histidine" [histidine]

• An essential amino acid, C6H9N3O2, important for the growth and repair of tissues. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "By re-programming the code of a DNA molecule, e.g. changing the word CAC to GAC, it would be possible to obtain a protein in which the amino acid histidine is replaced by the amino acid aspartic acid."
• "The gene containing the bacteria's LOV domain also codes for a signaling protein called a histidine kinase."
• "Amino acids, such as histidine, produced by pathways related to nucleotide metabolism, but not found in spark-tube experiments, are in fact excellent candidates for inclusion because they interact well with the RNA that must be present."