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Residues that are important for the formation of the cpSRP54-cpSRP43 binding interface are conserved in land plants but not in chlorophytes. Sequence alignment of the cpSRP43-binding motif in cpSRP54 (A) and the twinned cage-forming region of cpSRP43-CD2 (B) from various organisms of the green lineage (further details are given in the legend to Fig. 1).
