The P{SUPor-P}l(3)KG06256KG06256 insertion maps between Ssl1 and Chro. Expression levels of Chro protein appear normal in homozygous third instar larvae, suggesting that the insertion does not affect the Chro gene and that the lethality of the P{SUPor-P}l(3)KG06256KG06256 insertion is likely due to an effect on Ssl1.