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Fig. 2. Molecular cloning of sdf-9. (A) Genetic and physical map of the sdf-9 region. The arrows indicate genes predicted by the C. elegans genome project. Genomic DNA fragments containing the predicted gene Y44A6D.4 rescued the Daf-c phenotype of unc-31(e169); sdf-9(ut187) double mutants. (B) Structure of sdf-9 gene and reporter constructs. Boxes represent exons. pKO2 and pKOG7 rescued the unc-31(e169); sdf-9(ut187) Daf-c phenotype.