So let's begin with alpha cells. So alpha cells are basically those cells that produce and secrete a peptide hormone known as glucagon. And glucagon is stimulated and released when we have low glucose concentration inside our blood, for example, when we are fasting. Now, certain people experience a condition known as hypoglycemia. And hypoglycemia simply means we have an abnormally low concentration of glucose inside our blood. And what happens is these alpha cells release glucagon.