Figure 2. Schematic representation of vector constructs used in this study. The lentiviral vector (A) “Lego-MP-muFlu” and the gammaretroviral vector (B) “MP91-muFlu” are displayed [not to scale]. MPSV, myeloproliferative sarcoma virus; LTR, long-terminal repeat; MESV, murine embryonic stem cell virus; IRES, internal ribosome entry site; wPRE, Woodchuck hepatitis virus post-transcriptional regulatory element; P2A, 2A sequence of porcine teschovirus-1; eGFP, enhanced green fluorescent protein; SD, splice donor; SA, splice acceptor.