PA099 Cytochrome b6-f complex subunit 4 17 kDa polypeptide Component of the cytochrome b6-f complex, which mediates electron transfer between photosystem II (PSII) and photosystem I (PSI), cyclic electron flow around PSI, and state transitions (By similarity). 160 petD MGVTKKPDLNDPVLRAKLAKGMGHNYYGEPAWPNDLLYIFPVVILGTIACNVGLAVLEPSMIGEPADPFATPLEILPEWYFFPVFQILRTVPNKLLGVLLMVSVPTGLLTVPFLENVNKFQNPFRRPVATTVFLIGTAVALWLGIGATLPIEKSLTLGLF PETD_ORYSA