lin-12::gfp expression was not detected in M lineage cells at the 1-M and 2-M stages. However, at the 4-M to 8-M stages,
lin-12::gfp expression was observed in all M-derived cells, with the same intensity in both the dorsal and the ventral sides. At the 10-M stage and later,
lin-12::gfp is still detected in both dorsal and ventral M-derived cells, but become more restricted along the anteroposterior axis.
lin-12::gfp appears to be gradually lost in the anterior M lineage cells, but retained in the posterior M lineage cells that are the precursors of CCs (M.dlpa and M.drpa) and BWMs (M.dlpp and M.drpp) on the dorsal side and precursors of SM/BWMs (M.vlpa and M.vrpa) and BWMs (M.vlpp and M.vrpp) on the ventral side.