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This study examined the effects of polychlorinated biphenyls (PCBs) on the development of amphibians using Xenopus laevis and Rana temporaria as experimental animals. Amphibians were exposed at different life stages and via different routes to the technical mixtures Clophen A50 and Aroclor 1254 or to a non-ortho PCB congener (PCB 126). The effects of PCB exposure in amphibians, such as mortality,...