Sequence alignment between 2zvl(A) and UniProt seq P12004 (PCNA_HUMAN):

P12004 (PCNA_HUMAN): Proliferating cell nuclear antigen from Homo sapiens 
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260 
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-
UniProt: MFEARLVQGSILKKVLEALKDLINEACWDISSSGVNLQSMDSSHVSLVQLTLRSEGFDTYRCDRNLAMGVNLTSMSKILKCAGNEDIITLRAEDNADTLALVFEAPNQEKVSDYEMKLMDLDVEQLGIPEQEYSCVVKMPSGEFARICRDLSHIGDAVVISCAKDGVKFSASGELGNGNIKLSQTSNVDKEEEAVTIEMNEPVQLTFALRYLNFFTKATPLSSTVTLSMSADVPLVVEYKIADMGHLKYYLAPKIEDEEGS
         ...............................................................................................X........................................................................................XXXXXXXXX....................................................................
PDB seq: MFEARLVQGSILKKVLEALKDLINEACWDISSSGVNLQSMDSSHVSLVQLTLRSEGFDTYRCDRNLAMGVNLTSMSKILKCAGNEDIITLRAEDN-DTLALVFEAPNQEKVSDYEMKLMDLDVEQLGIPEQEYSCVVKMPSGEFARICRDLSHIGDAVVISCAKDGVKFSASGELGNGNIKLSQ---------AVTIEMNEPVQLTFALRYLNFFTKATPLSSTVTLSMSADVPLVVEYKIADMGHLKYYLAPKI------
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+----- ---+---------+---------+---------+---------+---------+---------+---------+---------+----         ------+---------+---------+---------+---------+---------+-----      
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180                 200       210       220       230       240       250