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Fig. S1 Expression of zebrafish opn4-related genes in unique patterns in multiple retinal cell types. (A) Schematic diagram of the multilayered retina of the zebrafish larval eye with the photoreceptor cell layer (PCL), inner nuclear cell layer (INL), ganglion cell layer (GCL) and lens indicated. (B–J) Whole mount single or double RNA in situ hybridization at 5 dpf with the indicated probes. (B,C) opn4xa is expressed in a subset of cells in the GCL that coexpress gc56. (D–F) opn4xb, opn4a and opn4b are all expressed in subregions of the INL and some cells (G–I) coexpress bipolin (bip), a marker of bipolar cells. (J) opn4.1 is transcribed in horizontal cells in the outer lamina of the INL.