title: Morphological studies of possible neuroendocrine structures in Helisoma tenue (Gastropoda: Pulmonata).
mesh_terms: D000818:Animals; D003594:Cytoplasmic Granules; D005724:Ganglia / Q000166:cytology*; D006003:Glycogen; D006321:Heart / Q000294:innervation; D006652:Histological Techniques; D008854:Microscopy, Electron; D009469:Neuromuscular Junction; D009474:Neurons / Q000166:cytology; D009490:Neurosecretory Systems / Q000166:cytology*; D012908:Snails / Q000033:anatomy & histology*
chemical_list: D006003:Glycogen