Raviola, E Gap junctions between photoreceptor cells in the vertebrate retina. [electronic resource] - Proceedings of the National Academy of Sciences of the United States of America Jun 1973 - 1677-81 p. digital Publication Type: Journal Article ISSN: 0027-8424 Standard No.: 10.1073/pnas.70.6.1677 doi Subjects--Topical Terms: AnimalsFreeze EtchingHaplorhiniMacacaMicroscopy, ElectronPhotoreceptor Cells--cytologyRabbitsSynaptic MembranesTurtles