Sequence alignment between 4xk8(I) and UniProt seq P17227 (PSAI_PEA):

P17227 (PSAI_PEA): Photosystem I reaction center subunit VIII from Pisum sativum 
                 10        20        30        40
         ---------+---------+---------+---------+
UniProt: MINLPSLFVPLVGLLFPAVAMASLFLHVEKRLLFSTKKIN
PDB seq: -INLPSLFVPLVGLLFPAVAMASLFLHVEK----------
          --------+---------+---------+          
                 10        20        30