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Elevated interleukin (IL)-6 in the plasma of aged mice in response to peripheral lipopolysaccharide (LPS) injection. Young adult and aged mice were injected i.p. with either saline or LPS and IL-6 was measured in plasma collected 24 h later. Bars represent the mean ± SEM (n = 6). There was no detectable IL-6 (n.d.) in the plasma of saline-treated mice. Means with (*) are significantly different (P<0.05).
