PCDH-CMV-MCS-EF1-CopGFP-T2A-Puro polyclonal site (MCS) - in MCS is located in the CMV promoter downstream of interest gene cloning.To improve stability and CMV driven transcription translation. SV40 multi - poly adenosine acidification signal to enable the efficiency of transcription and transcription termination. The hybrid / RSV 5ltr promoter provides a high level of viral transcript expression in 293 cells of this full-length producer.