7441fa2e_sis_system___Life_Technologies__Problem
[Reason] All-trans retinal is bleached [Solution] All-trans retinal is a photolabile substrate; store in the dark. [Problem] 
Colorimetric control assay does not produce pink color, but protein is expressed
MembraneMax™ Protein Expression Kits | for expression of recombinant membrane proteins in a cell-free protein synthesis system | Life Technologies