A P-element is inserted in the first exon of Su(var)3-9.
One copy of Su(var)3-92A5 strongly suppresses position effect variegation (PEV) at the w locus caused by In(1)wm4.
One copy of Su(var)3-92A5 is unable to suppress the telomeric position effect (TPE) in stocks carrying a variegating P{hsp26-pt-T}39C-5 insertion at the telomere of the left arm of chromosome two.