Cell lineage of regularly developing sea urchin embryo: No1

Cell name

 No1

Cleavage number

 4

Number of cells after cleavage

 16

Cleavage direction (with respect to the A/V axis)

 vertical

Mother cell

 No

Sister cell

 No2

Progeny

 No1u, No1l

Tier

Prospective territory

 Oral ectoderm
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