tetragastrin

tet·ra·gast·rin

(tet'ră-gas'trin),
1. A tetrapeptide (Trp-Met-Asp-Phe-NH2) used to test the secretion of digestive juice.
2. A pterin derivative that is a required cofactor for a number of enzymes; for example, in the conversion of l-phenylalanine to l-tyrosine; the inability to synthesize tetrahydrobiopterin is associated with forms of malignant hyperphenylalaninemia.
References in periodicals archive ?
Distinct effects of tetragastrin in rat gastroduodenal mucosa on mucin content and mucosal protective action against histamine-induced injury.