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Embryology of sea urchin: 32 cells stage

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blastomeres

 
English name: Sea urchin
Scientific name: Psammechinus sp.
Familia: Echinidae
Classis: Echinoidea
Phylum: Echinodermata
Regnum: Animalia
In the successive cleaving rounds 2, 4, 8, 16, 32, 64, 128 a.s.o. blastomeres are formed. After a while it becomes difficult to track each single cell. This is problably a cluster consisting of 32 cells.
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One stage back.

last modified: 5 Jun 2014