Fig. 2. A cca-1::GFP gene fusion is expressed in the pharyngeal muscle. (A) Transgenic animals carrying an extra-chromosomal array including a full-length cca-1::GFP fusion (strain TS321) exhibit GFP fluorescence in all pharyngeal muscle including cells of the procorpus (pc), metacorpus, the isthmus (i) and in the terminal bulb (tb). The intense staining in the posterior of the terminal bulb is localized to the pm8 muscle cell. The asterisk indicates expression in extrapharyngeal neurons (n) and sheath cells (s) in the head. A differential interference contrast (DIC) image of the same worm is shown in B for comparison. Labeling as in A.