Expr4240
Very weak vulval muscle cell expression was observed for the F54C9.11::gfp fusion generated by fosmid recombineering. The GFP could just be seen despite the strong, background, endogenous, intestinal autofluorescence that appears yellow with the filter set used. CFP could not be detected for the F54C9.11::cfp fusion, but the filter set used to observe this fluor meant that the autofluorescence appeared blue, the same colour as the reporter signal, and thus a weak vulval expression may not have been discernable.