Figure 2From: A microbial platform for renewable propane synthesis based on a fermentative butanol pathway Total butanol produced by the engineered E. coli BL21 strains . Total butanol concentration obtained after 72 h of cultivation of E. coli wild-type cells harbouring engineered constructs is shown. The experimental protocol is described in the ‘Materials and methods’ section. Error bars are standard deviation (n = 4).Back to article page