Figure 2. LEP503 promoter specifically, but relative weakly, induced expression of EGFP in HLECs. The hPGK promoter and LEP503 promoter-induced EGFP expression in HLECs was detected by fluorescence microscopy (A, B) and FACS (C, D). RT–PCR analysis of EGFP expression showed that PGFPTK can be expressed well in HLECs and RPECs. However, LGFPTK was specifically expressed in HLECs and not in RPECs (E).