Fig. 3.

Growth rate of WT and mutant urease cell lines from two separate growth experiments (1, 2). The WT cell line was grown in nitrate free (white), nitrate (dark grey) and urea (light grey) enriched media. Mutant cell lines were grown in nitrate or urea enriched media. Growth rate (division day⁻¹) was measured in exponential phase and rates compared using analysis of variance with Tukey’s pairwise comparisons