Neurokinin-3 receptors (NK3R) are a type of protein found in the brain and other parts of the body. They belong to a family of receptors that respond to neuropeptides, which are small proteins that transmit signals between nerve cells. NK3R specifically binds to a neuropeptide called neurokinin B, playing a crucial role in regulating various physiological functions, including mood, stress response, and reproductive behaviors. These receptors are of interest in medical research, particularly for their potential role in treating conditions like depression and anxiety. By understanding how NK3R function, scientists hope to develop new therapies that can target these receptors to improve mental health and overall well-being.