Fig. 2: Endosporulation provided bacteria with a refuge from phages.

We demonstrate that phage SPO1 cannot attach to endospores of wild type Bacillus subtilis. Percent adsorption was calculated from the decline in free phages over 5 min when mixed with either purified endospores or vegetative cells. Mean (○) and standard deviation of four biological replicates (●) are shown. Grey bars indicate the lower limit of the 95% confidence interval of a one-sided t-test for each of the host cell types.