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