Sequence alignment between 1mje(B) and UniProt seq P60896 (SEM1_HUMAN):

P60896 (SEM1_HUMAN): 26S proteasome complex subunit SEM1 from Homo sapiens
                 10        20        30        40        50        60        70
         ---------+---------+---------+---------+---------+---------+---------+
UniProt: MSEKKQPVDLGLLEEDDEFEEFPAEDWAGLDEDEDAHVWEDNWDDDNVEDDFSNQLRAELEKHGYKMETS
         .........................XXXXXXXXXXX..........XXXX....................
PDB seq: ------PVDLGLLEEDDEFEEFPAE-----------HVWEDNWDDD----DFSNQLRAELEKH-------
               ---+---------+-----           ---+-----+    ---------+---       
                 10        20                  40    50            60