NL(left)1

Cell lineage of regularly developing sea urchin embryo: NL(left)1

Cell name	NL(left)1
Cleavage number	4
Number of cells after cleavage	16
Cleavage direction (with respect to the A/V axis)	vertical
Mother cell	NL(left)
Sister cell	NL(left)2
Progeny	NL(left)1u, NL(left)1l
Tier
Prospective territory