Fig. 5. FOS-1 is expressed in the intermediate precursors and co-localizes with
EGL-13 during the
lineage. (A) fos-1 locus
with isoform a, b, and putative c translational starts and
origin of plastFOS-1c::YFP indicated. (B-F) Late L3 stage. (B)
The AC (black arrowhead) is invading underlying primary vulval cells (black
bracket). (D) Approximately 5 µm from B, FOS-1c is expressed in all dorsal
and ventral uterine cells including the VU intermediate precursors (C, white
arrowheads). (E) Three
cells express egl-13::CFP (white
bracket). (F) Merged image of D and E showing that FOS-1c co-localizes with
egl-13 at specification. (G-J) Mid L4 stage. (H) FOS-1c is
broadly expressed in numerous uterine cells. White arrows point to six
cell daughters plus the AC. (I)
descendants continue to express
egl-13::CFP. (J) Merged image of H and I showing FOS-1c also
co-localizes to the
descendants. Asterisks mark non-specific fluorescence
from the GFP co-transformation marker. Scale bar: 10 µm.