Na

Cell lineage of regularly developing sea urchin embryo: Na

Cell name	Na
Cleavage number	3
Number of cells after cleavage	8
Cleavage direction (with respect to the A/V axis)	horizontal
Mother cell	A
Sister cell	VA
Progeny	Na1, Na2
Tier
Prospective territory	Aboral ectoderm (lineage founder cell)