Dark recovery kinetics of <i>E. coli</i> colonies expressing selected YtvA mutants.

<p><b>A.</b> Dark relaxation of YtvAL to YtvAD after 5 minutes illumination with LED465 of <i>E. coli</i> colonies expressing the R63K mutant of YtvA. <b>B.</b> Dark relaxation of YtvAL to YtvAD after 5 minutes illumination with LED465 of <i>E. coli</i> colonies expressing Q123N YtvA. Green curves were measured for colonies smeared on a glass coverslip, red curves were obtained for colonies soaked in an isotonic buffer. Black curves are the best fits to stretched exponential decays. Parameters are reported in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0107489#pone-0107489-t001" target="_blank">Table 1</a>.