In drug research, some guinea pigs are now human.
Pollack
Andrew
A
D002986:Clinical Trials as Topic / Q000191:economics; D004341:Drug Evaluation / Q000379:methods; D004345:Drug Industry; D006801:Humans; D033281:Nontherapeutic Human Experimentation; D012107:Research Design; D035703:Therapies, Investigational; D014481:United States; D014486:United States Food and Drug Administration