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Its a synthetic 15-amino-acid chain based on a fragment of a protein found in gastric juice, and that origin gives it an unusual property: its stable in the acidic conditions of the stomach
Syst Rev (2019) 8:279
The somatotrophic system involves circulating GH and IGF1, and the local production (autocrine or paracrine) of GH and IGF1 in several tissues (Figure 1)
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