NCIt definition : Cytoplasmic Hypoxanthine Phosphoribosyltransferases (Purine/Pyrimidine Phosphoribosyltransferase
Family) catalyze the conversion of 5-phosphoribosyl-1-pyrophosphate and hypoxanthine,
guanine, or 6-mercaptopurine to the corresponding 5'-mononucleotides and pyrophosphate.
The enzyme is important in purine biosynthesis as well as central nervous system functions.
(NCI);