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. 2017 May 11;16:81. doi: 10.1186/s12934-017-0698-5

Fig. 2.

Fig. 2

Screening of mutants with better thermostability (→). After being treated at 60 °C for 55 min, the clones were overlayed with 0.3 mg/mL α-naphthyl acetate and 1.3 mg/mL Fast Blue B. Clones with enhanced thermostability (M1) rapidly turned deep brown around the colony