“… melatonin up-regulated the level of … growth factor-β (TGF-β), macrophage-colony stimulating factor (M-CSF), tumor necrosis factor-α (TNF-α) and stem cell factor (SCF) in PEC, and the … of interleukin-1β (IL-1β), M-CSF, TNF-α, interferon-γ (IFN-γ) and SCF in splenocytes.”