<i>fntb-1</i> is expressed in VC4 and VC5 neurons.

<p>(A) <i>Pfntb-1</i>::<i>GFP</i> expression in the mid-body region of an L4 hermaphrodite. <i>Pfntb-1</i>::<i>GFP</i> expression in the head (B) and tail (C) region of an L4 hermaphrodite. The <i>fntb-1</i> promoter is active in neurons, vulval and rectal epithelial cells and in muscle cells. (D) <i>Pfntb-1</i>::<i>GFP</i> transcriptional activity in VC4 and VC5 (arrows), HSNs (asterisks) and vulval epithelial cells at the mid-L4 stage vulval region. (E) Adult vulval region showing FNTB-1::GFP protein fusion predominantly localized to the cytoplasm of VC4 and VC5 neurons. Panels A, D and E show ventral views. Panels B and C show side views. Scale bars, 10μm.</p>