Fig. 5From: Development of an auto-inducible expression system by nitrogen sources switching based on the nitrogen catabolite repression regulationOverexpression of CatB in NSAES. a CatB activity in difference of NO3−/NH4+ concentrations. b Biomass of A.n-PniaD-CatB in difference of NO3−/NH4+ concentrations. c SDS-PAGE analysis of CatB. The red arrow points to the CatBBack to article page