NCIt definition : One of three cell types that are found in the gastric or parathyroid glands, or in
the carotid body. Gastric chief cells secrete pepsinogen and chymosin. Parathyroid
chief cells secrete parathyroid hormone. Type 1 (chief) cells in the carotid body
contain neurosecretory vesicles that may play a role in chemoreception.;