The importance of recycling.
D000818:Animals; D006801:Humans; D009711:Nucleotides / Q000235:genetics / Q000378:metabolism*; D010430:Pentosyltransferases / Q000235:genetics / Q000378:metabolism*; D014122:Toxoplasma / Q000201:enzymology*
D009711:Nucleotides; D010430:Pentosyltransferases; C083867:hypoxanthine-guanine-xanthine phosphoribosyltransferase