gfp is expressed in all rectal cells in transgenic L1 larvae, including Y, and then in all rectal cells except for P12.pa in transgenic L4 and older animals.
sem-4 is expressed in all rectal cells in L1s hermaphrodites (i.e., Y, U, B, F, K, and K') and in all rectal cells, including P12.pa, in L3 or older worms.
This reporter was expressed at low levels in the early somatic gonadal lineage. Prominent expression was first seen in Z1.pa and Z4.ap, and their descendants. In the L3 stage, the F12E12.5 reporter was expressed in ventral and dorsal uterine precursors. Reporter expression was not seen in early embryos, perhaps due to the limited sequences used to generate the reporter.