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.