title: The water spaces in cholinergic synaptic vesicles from Torpedo measured by changes in density induced by permeating substances.
mesh_terms: D000818:Animals; D001834:Body Water / Q000032:analysis*; D002458:Cell Fractionation; D002499:Centrifugation, Density Gradient; D004557:Electric Organ / Q000032:analysis*; D005399:Fishes; D013570:Synaptic Membranes / Q000648:ultrastructure; D013572:Synaptic Vesicles / Q000032:analysis* / Q000648:ultrastructure