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Rea et al. (2003) "Interleukin-6-gene C/G 174 polymorphism in nonagenarian and octogenarian subjects in the BELFAST study. Reciprocal effects on IL-6, soluble IL-6 receptor and for IL-10 in serum and monocyte supernatants." Mech. Ageing Dev. 124(4):555-561 (PubMed)