title: Fine structure of retinal synaptic organelles in lamprey and hagfish photoreceptors.
mesh_terms: D000818:Animals; D002462:Cell Membrane / Q000648:ultrastructure; D005399:Fishes / Q000033:anatomy & histology*; D006196:Hagfishes / Q000033:anatomy & histology; D007798:Lampreys / Q000033:anatomy & histology; D010786:Photoreceptor Cells / Q000648:ultrastructure*; D013569:Synapses / Q000648:ultrastructure*; D013572:Synaptic Vesicles / Q000648:ultrastructure