Fig. 7
From: Development of a counterselectable seamless mutagenesis system in lactic acid bacteria
p-Cl-Phe sensitivity of L. casei strains. Wild-type L. casei BL23 carrying an empty shuttle vector (a) or a derivative carrying the pheS* (b) were cultivated overnight in GM9 plates containing 10 mM p-Cl-Phe at 37 °C