Effects of light- and dark-adaptation on the photic microvilli and photic vesicles of the pulmonate snail Helix aspersa.
D000221:Adaptation, Ocular; D000818:Animals; D002462:Cell Membrane / Q000648:ultrastructure; D003623:Dark Adaptation; D005614:Freeze Fracturing; D006372:Helix, Snails / Q000648:ultrastructure*; D008854:Microscopy, Electron; D010786:Photoreceptor Cells / Q000502:physiology / Q000648:ultrastructure*; D012908:Snails / Q000648:ultrastructure*