So let's discuss each one of these cells. Let's discuss the hormone that each one of these cells releases and what the function of that specific hormone is. So basically, each one of these four types of cells that make up the eyelids of Langrehons are capable of producing and secreting its own hormone. 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.