Fig. 1. An smc1 null mutation increases expression of the ct^K allele of cut. (Lower left) A ct^K wing with margin nicks. (Lower right) Schematic of the cohesin complex. (Upper left) The distribution of wing nicks in ct^K males heterozygous for the viable P insertion used to generate smc1^exc46 (blue), and in ct^K males heterozygous for smc1^exc46 (red). The curved lines show normal distributions calculated from the histograms. (Upper right) Box plots of the wing nick distribution for both genotypes; horizontal lines for each box represent the tenth, twenty-fifth, fiftieth, seventy-fifth and ninetieth percentiles. The difference between the two distributions is significant using the Bonferroni/Dunn test (P<0.0001). The smc1^exc46 mutation gives fewer nicks, indicating greater cut expression.