Sequence alignment between 2fdn(A) and UniProt seq P00198 (FER_CLOA9):

P00198 (FER_CLOA9): 4Fe-4S ferredoxin FdxA from Gottschalkia acidurici (strain ATCC 7906 / DSM 604 / BCRC 14475 / CIP 104303 / KCTC 5404 / NCIMB 10678 / 9a) 
                 10        20        30        40        50      
         ---------+---------+---------+---------+---------+------
UniProt: MAYVINEACISCGACEPECPVNAISSGDDRYVIDADTCIDCGACAGVCPVDAPVQA
PDB seq: -AYVINEACISCGACEPECPVNAISSGDDRYVIDADTCIDCGACAGVCPVDAPVQA
          ---------+---------+---------+---------+---------+-----
                  10        20        30        40        50