Figure 4. Heat map depicting the ratio of maximum OD₆₀₀ of knockout mutants of PA1 relative to the maximum OD₆₀₀ of the Δcel wild-type strain on several C₁ or multi-C substrates (same concentrations as in Figure 2 ).

Maximum OD₆₀₀ values below 0.01 are indicated by grey. A significant difference in maximum OD₆₀₀ (determined by comparing the mean growth rate of three biological replicates using the t-test) with a p-value <0.05 is indicated by a * and a p-value <0.01 is indicated by **.