amine precursor uptake and decarboxylation cell
APUD cell

Merkel cells are sometimes considered APUD cells (an older definition.

APUD cells are considered part of the neuroendocrine system, and share many staining properties with neuroendocrine cells.

In pathology, an apudoma is an endocrine tumour that arises from an APUD cell from structures such as the ampulla of Vater,.

It is thought to originate from neuroendocrine cells (APUD cells) in the bronchus called Feyrter cells (named for Friedrich Feyrter).

APUD cells constitute a group of apparently unrelated endocrine cells, which were named by the scientist A.G.E. Pearse, who developed the APUD concept in the early 60's.

Cholecystokinin, a hormone secreted by the APUD cells located in the proximal mucosa of the small intestine is administered intravenously, this stimulates the pancreatic secretion of the digestive enzymes amylase, trypsin, and lipase.