(A) The epithelial marker CHE-14::GFP is expressed in Y. (Right) Fluorescent photomicrograph of Y expressing CHE-14::GFP in a newly hatched L1 animal (40 of 40 early L1s expressed
che-14 in Y). (Left) The corresponding Nomarski photomicrograph. CHE-14 can be detected at the apical side of the Y cell, bordering the rectal slit (white arrow), and some faint fluorescence can be seen in Y cytoplasm; note that both sides of the rectal slit are marked with CHE-14, although only one is shown in focus; arrowhead, Y nucleus.