Department of Zoology Faculty of Science Alexandria University Alexandria 21547 Egypt;
Department of Zoology Faculty of Science Damnhour University El Behara 22516 Egypt;
Neptunus pelagicus; vitellogenesis; vitelloginin and vitelline; native polyacrylamide gel electrophoresis(PAGE)Bis-Tris Gels; PAGE-SDS; western blot analysis; reverse transcription-polymerase chain reaction(RT-PCR);