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Comparison of predominant P7 motifs in mt Group I intron sub-groups. Most frequent P7 motifs in mt Group I intron sub-groups. Note that IB and IB3 have the same P7 motif, but that they are clearly distinct otherwise and identified with separate ERPIN models. IA3 introns have a frequent alternative motif A_C_GACUG … UAGUC_U (i.e., with a single nucleotide difference to the one depicted above).
