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The nucleotide and the deduced amino acid sequence of SPβ bnrdE and bnrdF genes. The two introns and an intein are indicated by lowercase type in the corresponding sequences. Residues complementary to B. subtilis 16S rRNA are underlined. Asterisks denote stop codons. Arrows indicate translational start codons. ▴ and ▾, extein-intein and exon-intron junctions.
