n. An essential amino acid C6H9N3O2 found in most animal proteins; essential for tissue growth and repair.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. an essential amino acid found in proteins that is important for the growth and repair of tissue
Word Usage
"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."