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SDS-PAGE (10% acrylamide) of various retinal fractions loaded with equal amounts of total proteins. Lane 1, crude retinal homogenate (starting material); lane 2, OPL-fraction; lane 3, SR-fraction. The SR-fraction contains five major polypeptide bands that migrated at 240, 60, 55, 43, and 30 kDa. Twenty micrograms of protein were applied on each lane.
