"In wild-type,
unc-5::lacZ is first expressed during L3 lethargus in hermaphrodite DTCs (Su et al., 2000; Fig. 6A), and
gon-1::GFP is expressed from L2 through L4 (Blelloch and Kimble, 1999). In
sys-1 hermaphrodites, neither marker is observed (Fig. 6B; not shown)."