Wild-type growth data in all conditions. (a) Average wild-type growth rates in all conditions. Conditions are grouped and colored by carbon source. Nitrogen sources are ordered by growth rate when paired with glucose, and all values are relative to the glucose:ammonium rate. Error bars represent standard error from 701 wild-type replicates. (b) A linear model fit to log-transformed growth values. Terms for individual carbon and nitrogen sources are colored, interaction terms are gray. All but the three terms marked with a black circle are significant (P < 0.01); error bars represent standard error.