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Fig. 3. stwl mutants are dominant suppressors of position-effect
variegation. (A) Eye of DX1 flies showing strong variegation.
(B,C) Eyes of DX1 flies also heterozygous for stwl
alleles showing suppressed variegation. (D) The DX1 variegated
phenotype was dominantly suppressed by a mutation in the histone
methyltransferase encoded by the Su(var)3-9 locus. (E) Graph
of optical density of extracted pigments from flies of the indicated
genotypes.