Expressed in the portion of the lineage that requires
lin-11. it was also expressed in the ventral uterus. Staining in animals with ventral uterine cells identified, based on Nomarski optics, to was either at the VU intermediate precursor cell stage or one round of cell division later (i.e. to contain either pi cells or their daughters). The
lin-11-lacZ reporter construct is expressed in the pi cells; this expression is first apparent shortly before the pi cell division. All 16 examined animals had staining in some or all of the pi progeny.