Table 1.

Enteroendocrine cells (EECs) and their secreted products in the gastrointestinal (GI) tract. (5-HT: 5-hydroxytryptamine; CCK: cholecystokinin; GLP-1: glucagon like peptide-1; GLP-2: glucagon like peptide-2; PYY: peptide YY; GIP: gastric inhibitory peptide-1).

EECs	Location	Hormones
A (X-like) cells	Stomach (corpus)	Ghrelin
D cells	Stomach (pylorum) Proximal segment of the small intestine	Somatostatin
EC cells	Stomach (pylorum), small and large intestine	5-HT
G cells	Stomach (antrum), duodenum	Gastrin
I cells	Small intestine Distal portion small intestine	CCK 5-HT
L cells	Distal portion of small intestine Colon (mainly in the proximal portion) Large intestine	GLP-1, GLP-2, PYY 5-HT
K cells	Small intestine	GIP 5-HT