title: Differentiation and degeneration of crayfish photoreceptors in darkness.
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D003400:Astacoidea / Q000033:anatomy & histology*; D002454:Cell Differentiation; D003624:Darkness; D004924:Escape Reaction; D008027:Light; D008854:Microscopy, Electron; D010786:Photoreceptor Cells / Q000254:growth & development* / Q000648:ultrastructure; D012160:Retina / Q000254:growth & development; D013997:Time Factors