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Distribution of aligned spacings of SD sequences for RP, PHX, and PMX gene classes. (A) Simplified diagram of the translation initiation complex formed between an E. coli mRNA and the 30S ribosomal subunit. The aligned spacing is designated as the distance between the center of the SD sequence GGAGG and the start codon AUG. (B and C) Histograms of the SD aligned spacings in the genomes of Escherichia coli K-12 (ESCCO) and Pyrococcus abyssi (PYRAB), respectively.
