Vasopressin (Antidiuretic Hormone). Vasopressin (arginine vasopressin, AVP; antidiuretic hormone, ADH) is a peptide hormone formed in the hypothalamus, then transported via axons to, and released from, the posterior pituitary into the blood. AVP has two principle sites of action: the kidney and blood vessels.
The Face That Launched 1,000 Awws. Like a tiny feline fashion model, this Persian kitten seems to know how to tilt her head just so. And wow, her eyes are stunning. It's no wonder that the Persian is one of the most popular cat breeds in the United States, according to the Cat Fanciers' Association.
Siberian cat breed look. The Siberian is a medium to large cat with a broad chest and a wedge-shaped head, topped off with tipped ears. Siberians have semi-longhaired coats and as mentioned, their top coat is waterproof with a dense, soft undercoat which grows thicker in the winter - a throwback to living through the cold Russian winters.