Sequence alignment between 4z7v(B) and UniProt seq O19707 (O19707_HUMAN):

O19707 (O19707_HUMAN): MHC class II HLA-DQ-beta-1 (Fragment) 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         
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------
UniProt: RDSPEDFVYQFKGMCYFTNGTERVRLVTRYIYNREEYARFDSDVGVYRAVTPLGPPAAEYWNSQKEVLERTRAELDTVCRHNYQLELRTTLQRRVEPTVTISPSRTEALNHHNLLVCSVTDFYPAQIKVRWFRNDQEETTGVVSTPLIRNGDWTFQILVMLEMTPQRGDVYTCHVEHPSLQNPIIVEWRAQSESAQSKMLSGIGGFVLGLIFLGLGLIIHHRSQKGLLH
         ........................................................................................................XXXXXXXXX...................XXX............................XXX...............................................................
PDB seq: --SPEDFVYQFKGMCYFTNGTERVRLVTRYIYNREEYARFDSDVGVYRAVTPLGPPAAEYWNSQKEVLERTRAELDTVCRHNYQLELRTTLQRRVEPTVTISPS---------LLVCSVTDFYPAQIKVRWF---QEETTGVVSTPLIRNGDWTFQILVMLEM---RGDVYTCHVEHPSLQNPIIVEWR----------------------------------------
           -------+---------+---------+---------+---------+---------+---------+---------+---------+---------+----         ------+---------+--   ----+---------+---------+---   ---+---------+---------                                        
                 10        20        30        40        50        60        70        80        90       100                 120       130       140       150       160       170       180