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Fig. 2. Pineal photoreceptors displaying hybridisation with the HPO1 (green-opsin) probe (arrows). Sagittal sections of the pineal organ of (A) cod larva, (B) early herring larva, (C) adult cichlid (Labidochromis cearuleus), (D) haddock larva, (E) adult zebrafish and (F) Atlantic salmon parr. Scale bar: A,C–F, 15µm; B, 9µm.