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Genetic determinants of Klus and K2 toxins. (A and B) Presence of L-A and M dsRNA molecules in K2 (A) and Klus (B) strains. Nucleic acids were obtained from reference killer yeasts K1 (F166), K2 (EX73), K28 (F182), Klus strains (Mlus-1 to Mlus-4), and K2 strains (M2-1 to M2-4) containing different virus isotypes. Samples were separated by agarose gel electrophoresis. The ethidium bromide staining of the gel is shown. The size markers correspond to a 1- to 15-kb molecular ruler (Bio-Rad).
