(hi - po- zan' - thin) [hypo-; xanthin], C 5 H 4 N 4 0. A nonpoisonous leuko- main. It occurs, accompanying adenin and guanin, in nearly all the animal tissues and organs rich in nucleated cells. In minute quantities it is a normal constituent of urine. It has also been found in plants, seeds, fer- ments, and wines. It is a crystalline body, soluble in cold and boiling water, insoluble in cold alcohol or ether. Hypoxanthin ap- pears to be one of the products formed by the decomposition and successive oxidation of proteid matter previous to the formation of uric acid and urea. It is produced from adenin by the action of nitrous acid. Syn., Sarcin. H., Test for. See KosseVs Test for Hypoxanthin.
Hyrtl's Sphincter. See Nelaton's Sphincter.
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