Figure 1.—

Models for genome regions surrounding five spontaneous visible mutants. (A–D) Mutants from the mrt-2 genetic background. (E) Mutant from the clk-2(mn159) background. Genome sequence is presented as contiguous cosmids (uppercase letters). Wild-type position of mutant genes is indicated by arrows. Sequence deleted for each mutant is indicated by shaded bars. Note that deletions affecting unc-17 and vab-8 occur in the promoters of these genes. G-tracts longer than nine nucleotides are indicated below the genome sequence and are labeled “G” if oriented 5′–3′ or “C” if oriented 3′–5′. The length of each G-tract is indicated and G-tracts at deletion breakpoints have an asterisk.