Fig. 4. Effect of remote preconditioning (RPC) on plasma dynorphin (  A ) and met-enkephalin (  B ) levels. The levels of dynorphin and met-enkephalin in plasma were measured by radioimmunoassay. Values are mean ± SD. n = 6 and 5 for dynorphin and met-enkephalin measurements, respectively. **P < 0.01  versus baseline.