Requirement of the proteasome for the trimming of signal peptide-derived epitopes presented by the nonclassical major histocompatibility complex class i molecule HLA-E Bland, F.A.; Lemberg, M.K.; McMichael, A.J.; Martoglio, B.; Braud, V.M. Journal of Biological Chemistry 278(36): 33747-33752 2003 https://eurekamag.com/research/011/287/011287908.php