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Comparison of structure/hishape spaces. All possible structures and hishapes were predicted for random sequences of lengths ranging from 20-120 nt, using RNASUBOPT -noLP and RNAHELICES with different abstraction levels and restricting to strictly negative (SN) structures, respectively. The average numbers of structures/hishapes for each length were fitted to the formula a×bn×n-3/2[15]. The numbers in parentheses give the values for b, which is the dominating factor in this term.
