No

Cell lineage of regularly developing sea urchin embryo: No

Cell name	No
Cleavage number	3
Number of cells after cleavage	8
Cleavage direction (with respect to the A/V axis)	horizontal
Mother cell	O
Sister cell	VO
Progeny	No1, No2
Tier
Prospective territory	Oral ectoderm (lineage founder cell)