اطوار التكوين الجنيني المبكر للسهيم 4.pdf · vitelline membrane...

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Early development stages of Amphioxus

fertilized egg stages

MEIOLECITHAL

ISOLECITHAL

2 – blastomers stage

http://upload.wikimedia.org/wikipedia/commons/c/c1/Lancelet%27s_embryo%2C_2_cells.jpg

4 – blastomers stage

http://upload.wikimedia.org/wikipedia/commons/4/4d/Lancelet%27s_embryo%2C_4_cells.jpg

8 – blastomers stage

16 – blastomers stage

Micromeres

Macromeres

32 – blastomers stage

blastula stage

Micromeres

Macromeres

GASTRULATION

gastrula stage

larvae of Amphioxus

Tail region

Movie time

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