Beta Cell

 (β cell) are a type of cell found in pancreatic islets that synthesize and secrete insulin. Beta cells make up 50-70% of the cells in human pancreatic islets. In patients with type I or type II diabetes, beta-cell mass and function are diminished, leading to insufficient insulin secretion and hyperglycemia.

His colleagues decided to hang themselves because they can't fulfill the overloaded insulin request. This mirrors the real-world apoptosis (programmed cell death) of beta cells in type I and type II diabetes.