factors: dietary protein and amino acids (meat), hypercalcemia. (i.e. during the gastric phase)
* Inhibitory factor: acidity (pH below 3) - a negative feedback mechanism, exerted via the release of somatostatin from ? cells in the stomach, which inhibits gastrin and histamine release.

Paracrine

* Stimulatory factor: bombesin or gastrin-releasing peptide (GRP)
*

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