Fig. 2

Characterization of induction of GFP from pBSG11 harbouring P43′-riboE1 element after induction by 4-mM theophylline. GFP induction is denoted by green histograms at different time points. The solid circles within in the histograms represent the level of induced GFP expression. Similarly, the open circles within the histograms are the corresponding basal expression level. The activation ratio was obtained by dividing the induced expression level by the corresponding basal level