(St. Louis, MO, USA). The DMEM medium was purchased from HyClone Co. (Los Angeles, USA). The 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) was purchased from Solarbio Co.

1 Department of Biological Sciences, Mycobacteria Research Laboratory, Institute of Structural and Molecular Biology, Birkbeck, University of London, London, UK 2 Department of Pharmaceutical and ...