title: Optical activity and the fixation of rods and cones.
mesh_terms: D000447:Aldehydes; D000818:Animals; D001001:Anura; D005557:Formaldehyde; D006652:Histological Techniques; D055095:Optics and Photonics; D010786:Photoreceptor Cells / Q000502:physiology*
chemical_list: D000447:Aldehydes; D005557:Formaldehyde