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IL-6 mRNA expression in mast cell-deficient mice. RNA was isolated from uninfected C57BL/6 mice (lane 1) and infected mice treated with no antibody (lane 2), with anti-c-kit antibody (lane 3) or with control IgG (lane 4). RNA was converted to cDNA, and IL-6 levels were determined from pooled samples (n = 4).
