Nucleated sites for the assembly of cytoplasmic microtubules in the ectodermal cells of blastulae of Arbacia punctulata.
D000818:Animals; D002467:Cell Nucleus; D002923:Cilia; D003594:Cytoplasmic Granules; D004447:Echinodermata / Q000196:embryology*; D004475:Ectoderm / Q000166:cytology*; D006056:Golgi Apparatus; D008854:Microscopy, Electron; D008870:Microtubules; D009024:Morphogenesis; D009940:Organoids; D013696:Temperature; D013997:Time Factors