title: A morphogenetic determinant in the anterior pole of an insect egg (Smittia spec., Chironomidae, Diptera): localization by combined centrifugation and ultraviolet irradiation.
mesh_terms: D000005:Abdomen / Q000002:abnormalities / Q000196:embryology; D000818:Animals; D003593:Cytoplasm / Q000528:radiation effects; D004175:Diptera / Q000196:embryology*; D005260:Female; D008854:Microscopy, Electron; D009024:Morphogenesis / Q000528:radiation effects; D010063:Ovum / Q000528:radiation effects / Q000648:ultrastructure*; D014461:Ultracentrifugation; D014466:Ultraviolet Rays