Figure 2: Secretion of interleukin-6 (A), interleukin-10 (B), and tumor necrosis factor-alpha (C) from THP-1 cells infected with Mycobacterium tuberculosis recombinants harboring truncated Rv2820c or vector alone. Mean concentration is shown while its error bars represents plus or minus standard error of the mean (±1 SEM) of three independent experiments performed in duplicate.