Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

In pigs, this peptides eighth amino acid residue is usually a lysine, but in humans, that residue is always arginine. Its receptors are blocked by tolvaptan, and it is sometimes inappropriately produced by small cell lung carcinomas. It is synthesized in the magnocellular neurons of the hypothalamus, and underproduction of or insensitivity to this hormone leads to diabetes insipidus. Its most important function sees it induce increased expression of aquaporin-2 in the collecting duct in the nephron, thus increasing blood volume. FTP, name this hormone produced by the posterior pituitary gland that causes water retention in the kidney and decreases the volume of the urine.

Science