title: Ultrastructural changes associated with an invagination phenomenon in embryonic neural aggregates.
mesh_terms: D000818:Animals; D002449:Cell Aggregation; D002462:Cell Membrane; D002467:Cell Nucleus; D002478:Cells, Cultured; D002642:Chick Embryo; D002923:Cilia; D046508:Culture Techniques; D007365:Intercellular Junctions; D008854:Microscopy, Electron; D008870:Microtubules; D008938:Mitosis; D009457:Neuroglia / Q000166:cytology*; D009899:Optic Lobe, Nonmammalian / Q000196:embryology; D011554:Pseudopodia; D013997:Time Factors