NL(right)1u

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

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