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mRNA expression levels of pro-inflammatory cytokines in cardiac allografts. The mRNA expression of IL-6, IL-2, IFN-γ, IL-4, IL-17A, VCAM-1, TNF-α, and iNOS in cardiac allografts 4 d post-transplantation in the control, tocilizumab, and IL-6-/- groups (n = 4/group). *P<0.05; **P<0.01; ***P<0.001.
