Sequence alignment between 5v2c(K) and UniProt seq P19054 (PSBK_THEVL):

P19054 (PSBK_THEVL): Photosystem II reaction center protein K (Fragment) from Thermostichus vulcanus 
                 10        20        30       
         ---------+---------+---------+-------
UniProt: KLPEAYAIFDPLVDVLPVIPVLFFALAFVVQAAVGFR
         .......................X.....X.......
PDB seq: KLPEAYAIFDPLVDVLPVIPVLFLALAFVWQAAVGFR
         ----------+---------+---------+------
                  20        30        40