Morphological observation of 6 dpf zebrafish larvae under BDE47 treatment and control. (A) Normal histological patterns of larval retina (40X). (B) Larvae exposed to 500 μg/l BDE47 had retinal morphology distinct from the control (40X). (C) Normal body type of zebrafish larvae in the control group (4X). (D) Body curvature phenotype after 500 μg/l BDE47 exposure (4X). RPE, retinal pigment epithelium; PCL, photoreceptor cell layer; INL, inner nuclear layer; IPL, inner plexiform layer; GCL, ganglion cell layer.