3 [[4 (4 chlorophenyl) 1 piperazinyl]methyl] 1h pyrrolo[2,3 b]pyridine Adaptation Adaptation, Ocular Animals B wave Cell Survival Cyclic AMP Darkness Dopamine Dopamine Agonists Dopamine D4 receptors Electroretinogram Glutamic Acid Light Light adaptation Mice Mice, Inbred C57BL Mice, Knockout Phagocytosis Photoreceptor Photoreceptors, Vertebrate Quinpirole Receptors, Dopamine D2 Receptors, Dopamine D4 Retina Rod Outer Segments animal experiment animal tissue article cAMP