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Distribution of structural motifs for various pools. (A) Motif distribution of 2–7 vertex structures. (B) Motif distribution of eight and nine vertex structures. The tree motifs are indexed (ID) by vertex number and order within the group (e.g., 51, 52, 53 for the three five-vertex members—see Fig. 2). Note that any motif IDs not represented on the horizontal axis are omitted because none of the sequences in the pool folded to such a structure.
