The following information accompanied stocks donated to the Bloomington Drosophila Stock Center by Todd Nystul at the University of California, San Francisco.  
P{UAS-gro.DD}2 is a second chromosome insertion, homozygous viable and fertile. 
This construct was published in Hasson et al. (2005). EGFR signaling attenuates Groucho-dependent repression to antagonize Notch transcriptional output. Nat. Genet. 37(1): 101--105