A 4,129 bp genomic DNA fragment starting at 2,619 bp upstream of the Root-RB ATG and containing part of the Root coding sequence is fused in frame to EGFP.
Root-GFP is observed in embryos in the rootlet processes of the chordotonal dendrites, faintly at the cilium tip, and clearly in axons. It is specific to chordotonal organs and is not observed in ciliated sensory neurons.