Xanthine ( or ; archaically xanthic acid) (3,7-dihydropurine-2,6-dione), is a purine base found in most human body tissues and fluids and in other organisms. (Wikipedia)(See all definitions)
To overcome the problem of limited BBB penetration, several research groups have explored methods to improve the transport rates of these marker/reporter probes across the BBB, for example, by creating new radiolabeled HSVl-tk substrates with increased lipophilicity, which facilitates passive diffusion of the radiotracer across the BBB [144], or by creating new reporter gene/reporter substrate systems, such as the xanthine phosphoribosyl transferase reporter enzyme. (thno.org)
Chocolate Chocolate contains theobromine, a xanthine compound which is in the same family as caffeine and theophylline - and is toxic to dogs and cats. (lindablairworldheart.org)
- Chocolate contains theobromine, which is a xanthine compound. (morenapethospital.com)