Normal erythrocytic delta-aminolevulinic acid dehydratase activity in ten nonhuman primate species

Normal data on erythrocytic delta-aminolevulinic acid dehydratase (ALAD) activity were obtained from ten species of nonhuman primates: Tupaia glis, Galago crassicaudatus, Saimiri sciureus, Papio spp., Theropithecus gelada, Macaca mulatta, Macaca fascicularis, Macaca nigra, Hylobates lar entelloides and Pan troglodytes. Significant differences between species were observed with M. mulatta having the lowest activity and G. crassicaudatus the highest. Pan troglodytes and Papio spp. have levels of erythrocytic ALAD activity most closely approximating that of man.