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Filters: Physicians Committee for Responsible MedicineInternational Primate Protection LeaguePrimarily Primates IncRegan, TomPeople for the Ethical Treatment of AnimalsHumane Society of the United StatesNew England Anti-Vivisection SocietyPsychologists for the Ethical Treatment of AnimalsNational Anti-Vivisection Society U.S. 1980-19891990-19992000-2009