... ligand-binding domain ▫ Other half-site is vitamin A derivative (9-cis-retinoic) acid  DNA-binding domain can then bind to the half-site of the HRE ▫ Two partners can bind to the DNA to activate... in the hypothalamus: • Antidiuretic hormone (ADH/vasopressin): • Promotes the retention of H20 by the kidneys • Less H20 is excreted in the urine • Oxytocin: • Stimulates contractions of the. .. specific fashion www.cambodiamed.com Endocrine Glands and Hormones (continued) • Neurohormone: • Specialized neurons that secrete chemicals into the blood rather than synaptic cleft • Chemical