4Velayati AA, Famia P, Ibrahim TA, et al. Diffefences in cell wall thickness between resistant and nonresistant strains of Mycobac- terium tuberculosis :using transmission electron microscopy. Chemotherapy,2009,55:303-307.
5Zhang Y, Ye WW. Mechanisms of drug resistance in Mycobacteri- um tuberculosis. Int J Tuberc Lung Dis,2009,13:1320-1330.
6Da Silva PE, VonGmll A, Martin A, et al. Efflux as a mechanism for drug resistance in Mycobacterium tuberculosis. EMS Immunol Med Micrebiol,2011,63:1-9.
7Olano J, Lopez B, Reyes A, et al. Mutations in DNA repair genes are associated with the Haarlem lineage of Mycobacterium tuber- culosis independently of their antibiotic resistance. Tuberculo- sis,2007,87:502-508.
8Rengarajan J, Sassetti CM, Naroditskaya V, et al. The folate path- way is a target for resistance to the drug para-aminosalicylic acid (PAS) in mycobacteria. Mol Microb,2004,53:275-282.
9Kumar P, Schelle MW, Jain M, et al. PapA1 and PapA2 are acyl- transferases essential for the biosynthesis of the Mycobacterium tuberculosis virulence factor Sulfolipid-1. Proc Natl Acad Sci USA,2007,104:11221 - 11226.
10Bhatt K, Gurcha SS, Bhatt A,et al. Two polyketide-synthase-as- sociated acyltransferases are required for sulfolipid biosynthesis in Mycobacterium tuberculosis. Microbiology,2007,153:513-520.
