egg balloon，oosphere
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- flagellated chamber
- testa
- urethral gland
- conserved domain
- granulated gel
- paranasal sinus
- BU (region)
- meiolecithal egg，microlectithal egg,oligolecthal egg
- protopod larva
- cold water species
- capsomer,capsomere
- terrestrial pollution
- Sphingomyelin
- heterogeneous nuclear rna
- tapetum
- siliceous sponges
- blocks world
- oral pole
- pseudomonas aeruginosa
- Ligia exotica