FIGURE 2.

A, probability matrix representing the relative frequency of each residue found at each position in the 3′-UTRs of the experimental data set. B, sequence alignment of six possible versions of the putative motif and motif found in RPA2, TRX, and ATR. Invariant nucleotides are in red boxes, and unmatched nucleotides are in italics. The position of the motif relative to the 3′-UTR start site is indicated in parentheses. C, predicted secondary structure of versions 1 and 6 of the putative hnRNP A18 motif.