Which cell type is NOT found in the Islets of Langerhans?

The Islets of Langerhans are clusters of cells located in the pancreas and play a crucial role in regulating blood sugar levels by secreting various hormones. The main types of cells found within the islets are alpha cells, beta cells, and delta cells, each of which has specific functions.

Alpha cells produce glucagon, which raises blood glucose levels by promoting the release of glucose from the liver. Beta cells are responsible for producing insulin, which lowers blood glucose levels by facilitating the uptake of glucose into tissues. Delta cells produce somatostatin, which helps regulate the endocrine system and inhibit the secretion of both insulin and glucagon.

The presence of alpha, beta, and delta cells in the Islets of Langerhans is well-documented. However, gamma cells are not typically classified as a major type in the islets. Hence, the identification of gamma cells as not being one of the standard cell types in the Islets of Langerhans makes this the correct answer. Understanding the specific roles and types of cells within the islets is key to grasping how the pancreas regulates metabolism and blood glucose homeostasis.