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.
No matter what kinds of kittens make you aw the most, there's sure to be a picture of kittens you think are the most adorable here! Many of these kitten breeds are in fact crossbreeds of domestic cats and wild cats. However, a great deal of the most adorable breeds of cats are not hybrids in the slightest.