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(a) Fractional mass plot for peptides and oligonucleotides from E. coli small ribosomal subunit. (b) Linear representation of the fractional mass plot in (a) as described in the text. The peptide fractional mass trend line fits the equation, fractional mass = 5.030 × 10-4 * MP + 5.313 × 10-2, and the oligonucleotide fractional mass trend line fits the equation, fractional mass = 1.287 × 10-4 * MO + 1.018 × 10-2.
