title: N-demethylation of N-14C-methyl-codeine in morphine tolerant and nontolerant rats and mice.
mesh_terms: D000388:Air / Q000032:analysis; D000818:Animals; D002245:Carbon Dioxide / Q000032:analysis; D002247:Carbon Isotopes; D003061:Codeine / Q000378:metabolism*; D004361:Drug Tolerance; D005260:Female; D008099:Liver / Q000378:metabolism; D008297:Male; D008745:Methylation; D009020:Morphine / Q000494:pharmacology*; D051381:Rats; D012737:Sex Factors
chemical_list: D002247:Carbon Isotopes; D002245:Carbon Dioxide; D009020:Morphine; D003061:Codeine