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Alignment of the upstream regions of the genes involved in xylanolytic system of S. thermoviolaceus OPC-520. The conserved sequences (5′-CGAA-Nx-TTCG-3′) are shown by white letters on a black background. The inverted repeat sequences are indicated by convergent arrows. The transcriptional start site of the bxl operon is indicated with +1. The putative −35 and −10 regions of the bxl operon are shown by boxes.
