UAS regulatory sequences drive expression of 'LAPD', a light-regulated phosphodiesterase. LAPD consists of the photosensor module (the PAS-GAF-PHY domains) of Deinococcus radiodurans bacterial phytochrome (Drad\BphP) fused to the effector module (amino acid residues 555-941) of Hsap\PDE2A. The photosensor module requires a biliverdin chromophore which is incorporated autonomously. Exposure to red light (690nm) activates hydrolysis of cAMP and cGMP, while far-red light (850nm) can be used to down-regulate activity (PMID:24889611).