Sequence alignment between 1gx7(E) and UniProt seq P00131 (CYC3_DESVH):

P00131 (CYC3_DESVH): Cytochrome c3 from Nitratidesulfovibrio vulgaris (strain ATCC 29579 / DSM 644 / CCUG 34227 / NCIMB 8303 / VKM B-1760 / Hildenborough)
                 10        20        30        40        50        60        70        80        90       100       110       120         
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------
UniProt: MRKLFFCGVLALAVAFALPVVAAPKAPADGLKMEATKQPVVFNHSTHKSVKCGDCHHPVNGKEDYRKCGTAGCHDSMDKKDKSAKGYYHVMHDKNTKFKSCVGCHVEVAGADAAKKKDLTGCKKSKCHE
PDB seq: ----------------------APKAPADGLKMEATKQPVVFNHSTHKSVKCGDCHHPVNGKEDYRKCGTAGCHDSMDKKDKSAKGYYHVMHDKNTKFKSCVGCHVEVAGADAAKKKDLTGCKKSKCHE
                               ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-------
                                       10        20        30        40        50        60        70        80        90       100