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Principal-coordinate analysis (PCoA) of the gut microbiota of zebrafish subjected to AgNP treatments of 15 days (A), 45 days (B), and 75 days (C). C, control; L, M, and H, exposure to low (10 μg/liter), medium (33 μg/liter), and high (100 μg/liter) concentrations of AgNPs, respectively; L-R, M-R, and H-R, recovery from exposure to low (10 μg/liter), medium (33 μg/liter), and high (100 μg/liter) concentrations of AgNPs, respectively.
