NL(left)1u

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

Cell name	NL(left)1u
Cleavage number	5
Number of cells after cleavage	32
Cleavage direction (with respect to the A/V axis)	horizontal
Mother cell	NL(left)1
Sister cell	NL(left)1l
Progeny	NL(left)1uu, NL(left)1ul
Tier	an1
Prospective territory