More recently it was shown that the mobile pool of
LHCII, which can shuttle between PSI and PSII, docks
to the H subunit of PSI [25]. The analysis of lines lacking
PSI-N led to the identification of a novel PSI subunit
(PSI-O) [26], whereas the molecular characterization of
lines without PSI-K, PSI-G, or both, revealed that the
stoichiometry of the four LHCI proteins is flexible