Fig. 1. Expression of elt-1 reporter gene in JG31 vpIs7 transgenic worms. (A) Embryo at approximately 200 minutes of development (pre-lima stage). (B) Comma stage embryo showing GFP expression in the lateral seam cells. (C) L1 showing GFP expression in retrovesicular ganglion. (D) L4 showing lacZ expression in lateral seam cells. (E) L3 and L4 larvae showing lacZ expression in ventral cord neurons. (F) Expression of lacZ in ventral cord neurons of an adult worm. (G) Adult worm with lacZ expression in retrovesicular ganglion and axon encircling the pharynx. (H) Expression of lacZ in vulval muscles. (I) GFP expression in SET cells of an adult male worm. A C. elegans embryo is approximately 50 µm in length. An adult hermaphrodite is approximately 1 mm in length.