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CdtB-sensitive strains and their cross-sensitivity properties. Deletion strains were transformed with empty vector and with CdtB, HO endonuclease, and YopM expression constructs, and diluted cultures were then spotted onto galactose plates. CdtB-sensitive strains without plasmid were spotted onto YPD and YPD plates containing 0.25 M HU. The spots on YPD plates were exposed to UV irradiation.
