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Caption: A molecular model of secretin, a peptide hormone secreted by S cells in the duodenum of the small intestine. As chyme enters from the stomach, secretin responds to the lower pH levels of the hydrochloric acid by signalling the pancreas to secrete a bicarbonate solution to neutralize the acidic contents. Additionally, secretin will stimulate the release of pepsin for protein digestion and glucagon to increase blood glucose levels. Atoms are coloured dark grey (carbon), light grey (hydrogen), blue (nitrogen) and red (oxygen).

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Keywords: 3 dimensional, 3-dimensional, 3d, artwork, cgi, chemistry, digitally generated, hormone, illustration, model, molecular graphics, molecular model, molecular modelling, molecule, peptide, secretin, secreting hormone

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