Quantitative PCR analysis of mce1 operon in M.tuberculosis H37Rv and VPCI591. (A)- Diagrammatic representation [not to scale] of the mce1 operon. Arrows indicate the position of primers. The hatched box depicts IGPr region. (B)- Fold difference in transcript level in VPCI591 over that of M.tuberculosis H37Rv for Rv0167, Rv0170 and Rv0174 in log phase (dotted) and stationary phase (hatched). The fold difference observed is the average of three independent experiments. Error bars represent the standard deviation.