Na2

Cell lineage of regularly developing sea urchin embryo: Na2

Cell name	Na2
Cleavage number	4
Number of cells after cleavage	16
Cleavage direction (with respect to the A/V axis)	vertical
Mother cell	Na
Sister cell	Na1
Progeny	Na2u, Na2l
Tier
Prospective territory	Aboral ectoderm