Kinetic changes in IL-1β and IL-6 expression in brainstem after brachial plexus avulsion. Mice were divided into 4 groups, control, 1, 3 and 6 month of brachial plexus avulsion (n = 5). IL-1β and IL-6 mRNA expression (A) and protein content (B) in brainstem were evaluated by real time PCR and ELISA assay respectively. The results were normalized against un-operated mouse, data are expressed as mean ± SEM. p < 0.05 *vs control.