Sequence alignment between 1f04(A) and UniProt seq P00171 (CYB5_BOVIN):

P00171 (CYB5_BOVIN): Cytochrome b5 from Bos taurus
                 10        20        30        40        50        60        70        80        90       100       110       120       130    
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+----
UniProt: MAEESSKAVKYYTLEEIQKHNNSKSTWLILHYKVYDLTKFLEEHPGGEEVLREQAGGDATENFEDVGHSTDARELSKTFIIGELHPDDRSKITKPSESIITTIDSNPSWWTNWLIPAISALFVALIYHLYTSEN
         ................................................X...X.......X...X.....................................................................
PDB seq: -------AVKYYTLEEIQKHNNSKSTWLILHYKVYDLTKFLEEHPGGEAVLRAQAGGDATANFEAVGHSTDARELSKTFIIGELHPDDR---------------------------------------------
                -------+---------+---------+---------+---------+---------+---------+---------+----                                             
                      10        20        30        40        50        60        70        80