title: Biochemical steps in visual transduction: roles for nucleotides and calcium ions.
mesh_terms: D015106:3',5'-Cyclic-GMP Phosphodiesterases / Q000378:metabolism; D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002463:Cell Membrane Permeability; D006152:Cyclic GMP / Q000378:metabolism*; D010777:Photochemistry; D011898:Ranidae; D012243:Rhodopsin / Q000378:metabolism; D012374:Rod Cell Outer Segment / Q000378:metabolism; D014785:Vision, Ocular / Q000502:physiology*
chemical_list: D012243:Rhodopsin; D015106:3',5'-Cyclic-GMP Phosphodiesterases; D006152:Cyclic GMP; D002118:Calcium