Sequence alignment between 2nx0(A) and UniProt seq P68190 (MYG_THUOR):

P68190 (MYG_THUOR): Myoglobin from Thunnus orientalis
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-------
UniProt: MADFDAVLKCWGPVEADYTTIGGLVLTRLFKEHPETQKLFPKFAGIAQADIAGNAAVSAHGATVLKKLGELLKAKGSHAAILKPLANSHATKHKIPINNFKLISEVLVKVMHEKAGLDAGGQTALRNVMGIIIADLEANYKELGFSG
         ...............................................................................................................X...................................
PDB seq: -ADFDAVLKCWGPVEADYTTIGGLVLTRLFKEHPETQKLFPKFAGIAQADIAGNAAVSAHGATVLKKLGELLKAKGSHAAILKPLANSHATKHKIPINNFKLISEVLVKVMQEKAGLDAGGQTALRNVMGIIIADLEANYKELGFSG
          --------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-------
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140