Little gastrin I explained

Little gastrin I is a form of gastrin commonly called as gastrin-17.^[1] 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.^[2]

Notes and References

1. Book: Mutt, Viktor. Gastrointestinal Hormones: Advances in Metabolic Disorders. Academic Press. 2013-10-22. 9781483215532. en.
2. Book: Gastrin. University of California Press. 1966-01-01. en.