Figure 5. The mRNA expression levels of the DSB-repair DNA polymerase POL4 and the error-prone DNA polymerases RAD30 and REV3, relative to the total expression level of the three essential DNA polymerases POL1, POL2 and POL3 in the seven environments.

Note that the expression levels are relative to those in YPD. The bar color represents the SNV mutation rate in the environment and the error bar represents the standard deviation. Difference in expression level between an environment and YPD is assessed by a t-test followed by Bonferroni correction for multiple testing (*, P < 0.05; **, P < 0.01). The six non-YPD environments are ordered from high to low growth rates on the X-axis.