👉 Chorioids are a group of small, circular, and often white or yellow in color cells that are found in the pineal gland. They play an important role in regulating the body's circadian rhythms, which are natural cycles of sleep-wake cycles. The chorioid cells are responsible for producing melatonin, a hormone that regulates the body's internal clock and helps regulate the sleep-wake cycle. Melatonin is produced by the pineal gland, which is located at the base of
