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Sequences of in vitro selected RNase MRP substrates. (A) Consensus sequence logo. (Arrow) RNase MRP cleavage site. (B) Frequencies of the occurrence of different sequences at positions +2 to +4 in all RNase MRP substrates. (C) Frequencies of the occurrence of different sequences at positions +2 to +4 in 40% of the strongest RNase MRP substrates.
