title: Visual identification of synaptic boutons on living ganglion cells and of varicosities in postganglionic axons in the heart of the frog.
mesh_terms: D000818:Animals; D001001:Anura; D001338:Autonomic Fibers, Postganglionic / Q000166:cytology*; D001369:Axons / Q000166:cytology*; D003594:Cytoplasmic Granules; D005725:Ganglia, Autonomic / Q000166:cytology*; D006346:Heart Septum / Q000294:innervation; D008854:Microscopy, Electron; D013569:Synapses