Hank’s Balanced Salt Solution (HBSS) (1×) (no pheno red) (Invitrogen), HEPES Buffer Solution (1 M) pH 7.2 to 7.5 (Invitrogen), IBMX (Sigma), cAMP standard, Eu-cAMP tracer, ULightTM-anti-cAMP, cAMP detection buffer, and BSA stabilizer were purchased from PerkinElmer. A commercially available HP Officejet Pro 8100 printer was used to print enzyme/inhibitor solutions. This printer was chosen because a high quality of output resolution was certified by the manufacturer, and these cartridges can be easily refilled. Readily available non-fabricated parchment paper was utilized as a substrate in the inkjet printer for the first time. The parchment paper was purchased from Lebus Corporation. The paper is made with 100% pure cellulose fiber. The basic weight and the size is 24 Lb., and 8 ½”x11”, respectively.