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PCR/RFLP analysis of genomic DNA from transfected cells. The 1025-bp amplification product was either digested with XhoI (lanes 3, 5, and 7) or not digested (lanes 2, 4, and 6). LT1-1B1 cell DNA was isolated before transfection (lanes 2 and 3) and after transfection (lanes 4 and 5). Lanes 6 and 7 were derived from control TK6 cell DNA. Lane 1 is the 100-bp molecular weight marker.
