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English: A typical lentiviral vector backbone plasmid. CMVp – the immediate early CMV promoter; delta 5’-LTR and delta 3’-LTR – the long terminal repeats with some deletions; Psi & RRE – the packaging sequence ψ and the Rev Response Element (RRE); PGKp – the mouse phosphoglycerol kinase promoter; EGFP-NLS – the gene for nuclear targeted enhanced GFP protein; ori-pMB1 – the multicopy origin of replication originating from the wild type plasmid pMB1; Ap-R – the ampicillin resistance marker, the gene for β-lactamase.