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IlvB leader peptide This family consists of the leader peptides of the ilvB operon. This region encodes a potential leader polypeptide containing 32 amino acids, 12 of which are the regulatory amino acids valine and leucine. A model for the multivalent regulation of this operon by valyl- and leucyl-tRNA is proposed on the basis of the mutually exclusive formation of five strong stem-and-loop structures in the leader mRNA.
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