Sequence alignment between 9is4(l) and UniProt seq P32974 (PSBL_CHLRE):

P32974 (PSBL_CHLRE): Photosystem II reaction center protein L from Chlamydomonas reinhardtii 
                 10        20        30        
         ---------+---------+---------+--------
UniProt: MARPNPNKQVVELNRTSLYWGLLLIFVLAVLFSSYIFN
PDB seq: -ARPNPNKQVVELNRTSLYWGLLLIFVLAVLFSSYIFN
          --------+---------+---------+--------
                 10        20        30