The fine structure of photoreceptors in a marine flatworm.
D000221:Adaptation, Ocular; D000818:Animals; D003624:Darkness; D005123:Eye / Q000294:innervation; D008854:Microscopy, Electron; D009940:Organoids; D011984:Sensory Receptor Cells / Q000166:cytology*; D014419:Turbellaria / Q000502:physiology*