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Analysis of the DNA fused on to the end of the marked chromosome in the HSV-tk- subclones G55 and G71. The plasmid sequences rescued from subclone G55 after a partial Sspl digestion, or subclone G71 after partial BamHI digestion (bold lines), indicated the presence of an inverted repeat of the plasmid sequences in both subclones. The location of the restriction sites BamHI (Bm), BgIII (Bg), ClaI (Cl), NruI (N) PvuI (Pv), SacI (Sa), SspI (Sp), XbaI (Xb), and XhoI (Xh) are shown.
