title: An ultrastructural analysis of the photoreceptors of the squid and their synaptic connections. I. Photoreceptive and non-synaptic regions of the retina.
mesh_terms: D000818:Animals; D003594:Cytoplasmic Granules; D049832:Decapodiformes / Q000033:anatomy & histology*; D000431:Ethanol / Q000494:pharmacology; D006652:Histological Techniques; D008854:Microscopy, Electron; D009899:Optic Lobe, Nonmammalian / Q000166:cytology / Q000187:drug effects; D010786:Photoreceptor Cells / Q000166:cytology*; D012160:Retina / Q000166:cytology* / Q000187:drug effects; D013569:Synapses / Q000166:cytology*
chemical_list: D000431:Ethanol