Brain capillary-enriched fraction was prepared from ddY mice intraperitoneally injected with 3 mg/kg LPS or saline. The fraction was digested with trypsin and the digest was injected into LC-MS/MS together with internal standard peptides. Each value represents the mean ± S.E.M. (n = 4). *p < 0.05 and **p < 0.01, significantly different from the saline-treated mice. N.D: not detected.