Assays for measuring the activity of this compound based on BRET and FRET methods include CAMYEL and FlCRhR (“flicker”). By forcing one enzyme to bind to calmodulin, a virulence factor produced by members of the genus Bordetella increases levels of this compound. The enzyme that produces this compound can be stimulated using Forskolin, (10[1])and is activated by the A subunit of cholera toxin, which increases intracellular levels of this compound by over 100-fold. Low glucose levels cause this molecule to allosterically bind to CRP as part of a positive regulation mechanism. (-5[1])Phosphodiesterases most commonly act on this compound, which is necessary for the activity of protein kinase A. (-5[1])For 10 points, name this secondary messenger molecule (-5[1])made (10[1])from ATP by adenylyl cyclase. (10[1])■END■ (10[2]0[2])