title: In vitro maturation of Arbacia punctulata oocytes and initiation of heavy body formation. An ultrastructural study.
mesh_terms: D000818:Animals; D002466:Cell Nucleolus; D002467:Cell Nucleus; D005260:Female; D002479:Inclusion Bodies; D008854:Microscopy, Electron; D008858:Microscopy, Phase-Contrast; D010063:Ovum / Q000166:cytology / Q000254:growth & development*; D012617:Sea Urchins / Q000166:cytology / Q000254:growth & development*; D013997:Time Factors