Sequence alignment between 4y2d(F) and UniProt seq P01887 (B2MG_MOUSE):

P01887 (B2MG_MOUSE): Beta-2-microglobulin from Mus musculus
                 10        20        30        40        50        60        70        80        90       100       110         
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------
UniProt: MARSVTLVFLVLVSLTGLYAIQKTPQIQVYSRHPPENGKPNILNCYVTQFHPPHIEIQMLKNGKKIPKVEMSDMSFSKDWSFYILAHTEFTPTETDTYACRVKHASMAEPKTVYWDRDM
         ....................................XXXXXX.......................................................XX....................
PDB seq: ---------------------QKTPQIQVYSRHPPE------LNCYVTQFHPPHIEIQMLKNGKKIPKVEMSDMSFSKDWSFYILAHTEFTPTETDT--CRVKHASMAEPKTVYWDR--
                              --------+------      -------+---------+---------+---------+---------+-------  +---------+-------  
                                     10                  30        40        50        60        70        80        90