Sequence alignment between 8f4f(M) and UniProt seq Q8DHA7 (PSBM_THEEB):

Q8DHA7 (PSBM_THEEB): Photosystem II reaction center protein M from Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1) 
                 10        20        30      
         ---------+---------+---------+------
UniProt: MEVNQLGLIATALFVLVPSVFLIILYVQTESQQKSS
         X...................................
PDB seq: XEVNQLGLIATALFVLVPSVFLIILYVQTESQQ---
         ---------+---------+---------+---   
                 10        20        30