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RnB axon defects in unc-6, unc-40, unc-51, and unc-130. pkd-2∷GFP (bxIs14) fluorescence is shown in the respective mutants (ventral views). In unc-6, unc-40, and unc-51, most or all axons extend anteriorly in bundles (arrows). Dorsoventral commissures are absent and there is very little fluorescence in the pre-anal ganglion (arrowhead; compare Figure 2A and Figure 3D). In unc-130, the phenotype is similar but less severe.
