A Combinatorial Amino Acid Code for RNA Recognition by Pentatricopeptide Repeat Proteins
Motif pairs from PPR10, HCF152, CRP1 and 37 RNA editing factors flanking the indicated nucleotide were used to construct sequence logos . Each logo shows the first fifteen positions of the P-type motif containing position 6, a gap, and then the first 5 positions of the following motif. 74, 48, 96 and 126 motif pairs were used to generate the A, G, C and U logos, respectively. The alignments used to generate the logos are shown in Figure S1.