Developing fertilization membranes.
D000818:Animals; D003594:Cytoplasmic Granules; D004447:Echinodermata / Q000196:embryology; D004625:Embryo, Nonmammalian / Q000166:cytology*; D005260:Female; D008854:Microscopy, Electron; D013499:Surface Properties; D013997:Time Factors; D014817:Vitelline Membrane / Q000166:cytology