Sodium dodecyl sulfate-polyacrylamide gel that shows the expression and purification of the recombinant diapophytoene desaturase from S. aureus. Lanes: M, molecular marker; 1, whole cells of transformants with pQE30; 2, whole cells of transformants with pQECRT-N; 3, membranes; 4, supernatant; 5, flowthrough Talon affinity resin; 6, fraction eluted with 100 mM imidazole.