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. Author manuscript; available in PMC: 2020 Nov 30.
Published in final edited form as: Surg Oncol Clin N Am. 2020 Apr;29(2):145–163. doi: 10.1016/j.soc.2019.11.002

Fig. 1.

Fig. 1.

Peptides identified in the mammalian gastroenteropancreatic system. a Somatostatin has all regulatory actions: endocrine, paracrine, neuroendocrine, autocrine. b RIA (radioim-munoassay) first described in 1959.28,29