Using state of the art genetic manipulation techniques to engineer cells, InSCREENeX offers novel, user friendly, mammalian cell systems as decision tools for drug development processes. These complementary, cellular screening tools SCREENflex™ and CI-SCREEN™ aim at all stages of the drug development process. The SCREENflex™ technology creates stable transgenic cell lines 50-70% faster than conventional recombinant techniques. More importantly, the SCREENflex™ cell systems are of unparalleled quality with regard to expression levels and stability of the transgene. The CI-SCREEN™ technology is an enabling tool. It creates physiological relevant cell systems in sufficient quantity for use in drug development campaigns.