Figure 1: Survivability of Mycobacterium tuberculosis recombinants harboring truncated Rv2820c or vector alone inside THP-1 cells. The colony forming unit (CFU) of recombinants was normalized to the CFU on day 0. Mean percentage is shown while its error bars represents plus or minus standard error of the mean (±1 SEM) of three independent experiments performed in duplicate. * P < 0.05; independent samples t-test (two-tailed).