Sequence alignment between 3a0b(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
PDB seq: KLPEAYAIFDPLVDVLPVIPVLFFALAFVVQAAVGF-
         ----------+---------+---------+----- 
                  20        30        40