title: A spiral cortical fiber system in fertilized sea urchin eggs.
mesh_terms: D000199:Actins / Q000032:analysis; D000818:Animals; D002455:Cell Division; D002462:Cell Membrane / Q000648:ultrastructure; D003593:Cytoplasm / Q000648:ultrastructure; D005260:Female; D008870:Microtubules / Q000648:ultrastructure; D008938:Mitosis; D012617:Sea Urchins; D013997:Time Factors; D015053:Zygote / Q000032:analysis / Q000648:ultrastructure*
chemical_list: D000199:Actins