UAS regulatory sequences drive expression of a Miga cDNA, in which a number of phosphorylation sites are mutated (amino acid replacements S68A, S71A, S77A, S81A, S84A, S87A, S89A, S93A, S98A, S102A, S105A and S107A). The open reading frame is tagged at the C-terminal end with RFP(Unk).