The Different Forms of Immunoreactive Gastrin in Blood and Tissue
Immunoreactive gastrin (IRG) is found in both tissues and blood. Gastrin was isolated as a polypeptide of seventeen amino acids (G-17) which is present in two forms designated gastrin I and gastrin.II. Gastrin II contains a sulphate group on the tyrosine residue at position 12; gastrin I is sulphate-free. Studies in recent years have established the heterogeneity of IRG in both tissue and blood [1, 2].
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