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