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Fig. 6 Changes in (A) mitochondrial ultrastructure in neurons, (B) average swimming speeds of the larvae in response to dark–light–dark photoperiod stimulation, (C) neurotransmitter levels, and (D) transcripts of genes related to the CNS and genes in neurotransmitter signaling pathways in zebrafish larvae after 400 μg/L DBDPE single exposure or coexposure with 160 μg/L NR. Values are presented as the mean ± SEM of four replicates. *P < 0.05 and **P < 0.01 indicate significant differences between the exposure and control groups; #P < 0.05 and ##P < 0.01 indicate significant difference between the coexposure group and the 400 μg/L DBDPE single group.