NL(left)

Cell lineage of regularly developing sea urchin embryo: NL(left)

Cell name	NL(left)
Cleavage number	3
Number of cells after cleavage	8
Cleavage direction (with respect to the A/V axis)	horizontal
Mother cell	L(left)
Sister cell	VL(left)
Progeny	NL(left)1, NL(left)2
Tier
Prospective territory