UAS regulatory sequences drive expression of "Flash-Pericam" (see PMID:11248055 for a description of the generation of "Flash-Pericam"). This protein consists of a circularly permutated form of EYFP that is tagged at the N-terminal end with a calmodulin binding peptide and at the C-terminal end with calmodulin.
No changes in fluorescence have been detected when robust neural activity is induced in the larval neuromuscular junction of animals expressing Avic\GFPFlashPericam.Scer\UAS.