One of a series of dominant suppressors of variegation, mostly selected on the basis of their ability to suppress the mottling of In(1)w^m4; where they have been tested, these mutations suppress variegated type position effects involving other loci as well. Two groups have performed extensive mutagenesis experiments, but there has apparently been no exchange of material nor any attempt to determine allelic relationships between the two samples of mutants. The Canadian group has designated its mutants as a Su(var)200 series for second-chromosome mutations and a Su(var)300 series for third-chromosome mutations. The German group uses Su-var(3)1, etc. to designate a series of suppressors on the third chromosome; Lindsley and Zimm (1992) reconciled these terminologies but keep them separate by altering the second nomenclature to Su(var)3-1, etc. Despite the fact that some mutants from the two groups map to virtually identical positions, Lindsley and Zimm (1992) listed them separately until appropriate complementation tests are performed. Most of these suppressors appear to be loss of function mutations and are frequently associated with deficiencies; in addition variegation suppression is often produced by heterozygous deficiencies for their loci. Of these, several have been shown to enhance variegation when duplicated (Tartof, Bishop, Jones, Hobbs and Locke, 1989).