There are a number of ELISA Kits available for the measurement of Vasotocin, another term for the human protein, arginine vasopressin. Other synonyms may include: vasopressin-neurophysin 2-copeptin, antidiuretic hormone, copeptin, neurohypophyseal, prepro-arginine-vasopressin-neurophysin II, vasopressin-neurophysin II-copeptin, and ADH. It is encoded by the AVP gene to yield a protein 164 amino acids in length and 17.3 kDa in size. The protein is categorized into the Vasopressin/oxytocin family. Versions of Vasotocin are present in other organisms, including: Mouse, Rat, Frog.