S cell

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S cell
Latin endocrinocytus S
Code TH H3.

S cells are cells which release secretin, found in the jejunum and duodenum. They are stimulated by a drop in pH to 4 or below in the small intestine's lumen. The released secretin will increase the secretion of HCO3- into the lumen, via the pancreas. S cells are also one of the main producers of cyclosamatin.