title: The fine structure of the collar cells in the optic tentacles of Helix aspersa.
mesh_terms: D000818:Animals; D002467:Cell Nucleus; D003594:Cytoplasmic Granules; D004721:Endoplasmic Reticulum; D004847:Epithelial Cells; D005724:Ganglia / Q000166:cytology*; D006056:Golgi Apparatus; D006652:Histological Techniques; D008853:Microscopy; D008854:Microscopy, Electron; D012908:Snails / Q000033:anatomy & histology*