The following information accompanied stocks donated to the Bloomington Stock Center by Shirley Weiss and Baruch Minke, Hebrew University of Jerusalem.
P{GMR-GAL4,UAS-w.RNAi} is a single construct carrying two components: GAL4 driven by the GMR promoter for expression in the eye and UAS driving expression of dsRNA for RNAi of the white gene. The construct is marked with yellow. It was originally constructed in the lab of Armin Huber. 
P{GMR-GAL4,UAS-w.RNAi}3 is a homozygous viable and fertile, third chromosome insertion.