AQP3, or Aquaporin 3, is a protein that functions as a water channel in cell membranes. It is part of the aquaporin family, which facilitates the transport of water and, in some cases, small solutes across cell membranes. AQP3 is primarily found in the kidneys, skin, and various epithelial tissues, playing a crucial role in maintaining water balance in the body. This protein is essential for processes such as urine concentration and skin hydration. Dysregulation of AQP3 can lead to various health issues, including dehydration and skin disorders. Understanding AQP3's function helps researchers explore potential treatments for these conditions.