Figure 1

TK gene expression detected with fluorescent microscopy. Shown here are the cells 24 hours after transfection under fluorescent microscope (×100). (a) NPC 5-8F cells transfected with pGL3-basic-hTERTp-TK-EGFP-CMV; (b) MCF-7 cells transfected with pGL3-basic-hTERTp-TK-EGFP-CMV; (c) NPC 5-8F cells transfected with pGL3-basic-TRETp-TK-EGFP; (d) ECV cells transfected with pGL3-basic-hTERTp-TK- EGFP.