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3-aa motif frequencies in two biological replicates obtained in the presence of Ery (Ery1 and Ery2). The inset represents a histogram of log2 ratios between replicates for 3-aa motifs having low statistical counting error (i.e., with >150 counts [blue], Fig S5) with an overlaid normal error curve (mean = 0.01, SD = 0.17 log2 units, equivalent to σ = 1.12 fold).
