title: On the possibility of sperm aster involvement in dorso-ventral polarization and pronuclear migration in the amphibian egg.
mesh_terms: D000818:Animals; D001001:Anura; D002022:Bufo arenarum; D002465:Cell Movement; D002467:Cell Nucleus; D005260:Female; D008297:Male; D009949:Orientation; D010063:Ovum / Q000166:cytology / Q000502:physiology*; D010860:Pigments, Biological; D013094:Spermatozoa / Q000502:physiology / Q000648:ultrastructure*
chemical_list: D010860:Pigments, Biological