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Cytopathic effect of proteinase K-treated parasporal inclusion proteins of B. thuringiensis strain 84-HS-1-11 (A, E, and I), the recombinant BFR1(pLEUK3.4S) (B, F, and J), and the type strain of B. thuringiensis serovar Israelensis (C, G, and K) on MOLT-4 (leukemic T cells), normal T cells, and HeLa cells. (D, H, and L) Mock-inoculated cells. All images were obtained by phase-contrast microscopy at 24 h postinoculation. Bar, 50 μm (A through H) and 75 μm (I through L).
