Sequence alignment between 2k39(A) and UniProt seq P62972 (UBIQP_XENLA):

P62972 (UBIQP_XENLA): Polyubiquitin (Fragment) from Xenopus laevis
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-------
UniProt: QKESTLHLVLRLRGGMQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLRLRGGMQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLRLRGG
PDB seq: ---------------MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVLRLRGG----------------------------------------------------------------------------
                        ---------+---------+---------+---------+---------+---------+---------+------                                                                            
                                10        20        30        40        50        60        70