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