mpk-1::gfp consistently absent from the F and U cells throughout larval development and in adulthood (expression of
mpk-1::gfp was observed in the rectal epithelial cells, including F and U, in 100% of wild type L1 (16/16), L2 (19/19), L3 (15/15), L4 (21/21) and adult (16/ 16)worms, while expressionwas observed in F and U cells in 0% of egl- 5
(n486) L1 (0/16), L2 (0/22), L3 (0/16), L4 (0/14) and adult (0/15) worms,