title: Letter: Mouse fibroblasts A9 are deficient in HPRT and APRT.
mesh_terms: D000225:Adenine; D000818:Animals; D002250:Carbon Radioisotopes; D002460:Cell Line; D005347:Fibroblasts / Q000201:enzymology; D006822:Hybrid Cells / Q000201:enzymology*; D007042:Hypoxanthines; D007739:L Cells / Q000201:enzymology; D051379:Mice; D009154:Mutation; D010430:Pentosyltransferases / Q000378:metabolism*; D014316:Tritium
chemical_list: D002250:Carbon Radioisotopes; D007042:Hypoxanthines; D014316:Tritium; D010430:Pentosyltransferases; D000225:Adenine