UASt regulatory sequences drive expression of the LD45776 cDNA (encodes the Stim-RA isoform) that has been altered to be resistant to RNAi by the P{UAS-Stim.RNAi.E} transgene (the nucleotide in the 3rd position of each codon in the 344bp targeted by this transgene has been mutated without altering the encoded amino acid sequence).