Sequence alignment between 4w9f(D) and UniProt seq Q15370 (ELOB_HUMAN):

Q15370 (ELOB_HUMAN): Elongin-B from Homo sapiens
                 10        20        30        40        50        60        70        80        90       100       110        
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+--------
UniProt: MDVFLMIRRHKTTIFTDAKESSTVFELKRIVEGILKRPPDEQRLYKDDQLLDDGKTLGECGFTSQTARPQAPATVGLAFRADDTFEALCIEPFSSPPELPDVMKPQDSGSSANEQAVQ
         ...............................................................................XXX......X.............................
PDB seq: MDVFLMIRRHKTTIFTDAKESSTVFELKRIVEGILKRPPDEQRLYKDDQLLDDGKTLGECGFTSQTARPQAPATVGLAF---DTFEALXIEPFSSPPELPDV----------------
         ---------+---------+---------+---------+---------+---------+---------+---------   -------+---------+--                
                 10        20        30        40        50        60        70                  90       100