The Su(var)3-9 cDNA is driven by a heatshock promoter and tagged with EGFP.
In the salivary glands of third instar larvae, Su(var)3-9hs.EGFP protein concentrates primarily at the chromocenters of polytene chromosomes and along the fourth chromosome, with some tagged protein detected at telomeres, and a few foci in the euchromatin.