Sequence alignment between 4pv1(F) and UniProt seq P83796 (PETM_MASLA):

P83796 (PETM_MASLA): Cytochrome b6-f complex subunit 7 from Mastigocladus laminosus 
                 10        20        30     
         ---------+---------+---------+-----
UniProt: MTEEMLYAALLSFGLIFVGWGLGVLLLKIQGAEKE
PDB seq: -TEEMLYAALLSFGLIFVGWGLGVLLLKIQGA---
          --------+---------+---------+--   
                 10        20        30