Little gastrin I

Little gastrin I is a form of gastrin commonly called as gastrin-17. This is a protein hormone, secreted by the intestine. Little gastrin I is a form of gastrin commonly called as gastrin-17. This is a protein hormone, secreted by the intestine. Gastrin II has identical amino acid composition to Gastrin I, the only difference is that the single tyrosine residue is sulfated in Gastrin II.