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Effect of the four vitamin K analogs on the infectivity of BP933W on E. coli DH5α. The concentrations of vitamin K analogs used were 362 μM for MSB, 724 μM for phylloquinone, 724 μM for menaquinone, and 72 μM for menadione, and the phage filtrate was treated with the analogs for 2 h. The error bars represent the SD from three independent experiments. *, P < 0.05; **, P < 0.01 (Student's t test).
