Semiquantitative immunoblots for thylakoid proteins separated by LiDS-PAGE. The proteins PsaB, PsaF, PsaG, PsaN, PC, Lhca1, Lhcb1, cytochrome (Cyt) f, CP47, and ATP synthase β subunit (AtpB) were detected for a series of wild-type and PPD1 RNAi mutant (Group IV) thylakoids. Values for protein amounts in the PPD1 RNAi mutants are given to the right of the blot panels.