Metabolic labeling of M. smegmatis strains overproducing EphD. The top panel shows a scheme of metabolic labeling of culture sets A, B, C, and D described under “Experimental procedures”; also shown is an autoradiogram of TLC analysis of radiolabeled fatty and mycolic acid methyl esters from whole cells of cultures A and B (radioactive label added 8 h before induction of recombinant EphD production) and C and D (label added in parallel with induction of recombinant EphD production). The samples were developed in n-hexane:ethyl acetate (95:5, v/v, three runs). α, α′, and epoxy indicate individual types of mycolic acid methyl esters; pHAM lane, M. smegmatis mc2155 pHAM; ephDtb lane, M. smegmatis mc2155 pHAM-ephDtb; ephDsmeg lane, M. smegmatis mc2155 pHAM-ephDsmeg.