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(A) PT site mapping across the E. coli B7A genome. From outer to inner circles: 1 to 7 (PT sites modified with 5%-10%, 10%-15%, 15%-20%, 20%-25%, 25%-30%, 30%-35%, 35%-40%): PT sites in ORFs (grey), in rRNA(yellow), tRNA (blue) and non-coding regions (red); 8: GC content; 9: GC skew. (B) The distribution analysis of PT modification frequency for GAAC/GTTC sites at different region in the genome.
