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Effect of calcium on zones of inhibition. Single colonies of R. leguminosarum 248 were stab inoculated into soft TY agar containing R. leguminosarum 336 as an indicator strain and either 1, 2.5, or 5 mM CaCl2. Zones of inhibition were scored after 48 h. n = 18 in each case. The error bars indicate standard deviations.
