Fine structure of cell contact and the synapse.
D000818:Animals; D000845:Annelida; D004447:Echinodermata; D008854:Microscopy, Electron; D009431:Neural Conduction / Q000502:physiology*; D009469:Neuromuscular Junction / Q000502:physiology*; D013569:Synapses / Q000033:anatomy & histology* / Q000502:physiology*; D014562:Caudata