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Prolonged extinction training has lasting effect on peripheral and central IL-6 signaling. a Study design. b Correlation between plasma levels of IL-6 after 12 CS re-exposures and total average freezing in response to those 12 CS (N=16). c Plasma IL-6 response to 12 CS in fear-conditioned mice exposed to either extinction training with 40 CS (Ext) or to 0 CS (No Ext) (n=8/group).
