Growth phenotypes of single and double bat1Δ and bat2Δ mutants.

aValues are shown relative to growth rate of the wild type strain (0.20 h−1 and 0.11 h−1 on NH4+ and amino acids, respectively); and represent the means from three independent experiments (variation was always ≤10%).bAmino acids were supplemented at a concentration of 150 mg/l, 100 mg/l or 30 mg/l of valine (V), leucine (L) or isoleucine (I) respectively.