UASt regulatory sequences drive expression of the entire Rnor\Camk2a coding sequence, mutated to carry T305D and T306D amino acid substitutions (abolishing calmodulin binding), and tagged at the N-terminal end with Venus and at the C-terminal end with a cyan fluorescent protein that has enhanced brightness (carries the S175G mutation). No change in fluorescence resonance energy transfer (FRET) between the two fluorophores is seen in response to Ca[2+] and calmodulin (details from PMID:15788767).