Sequence alignment between 8f4f(F) and UniProt seq Q8DIN9 (PSBF_THEEB):

Q8DIN9 (PSBF_THEEB): Cytochrome b559 subunit beta from Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1) 
                 10        20        30        40     
         ---------+---------+---------+---------+-----
UniProt: MTSNTPNQEPVSYPIFTVRWVAVHTLAVPTIFFLGAIAAMQFIQR
PDB seq: -----------SYPIFTVRWVAVHTLAVPTIFFLGAIAAMQFIQR
                    --------+---------+---------+-----
                           20        30        40