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Allele-specific inhibition of plaque formation in lawns carrying S105ΔTMD1. Dilutions of λS105 were plated on lawns of RY17341 carrying transactivating plasmids with the indicated S allele. (A) SW56am; (B) S105ΔTMD1; (C) S107; (D) S105ΔTMD1,A52G; (E) S105ΔTMD1,A52V.
