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Table 2 Relative Z-scores for the occurrences of different 1 × 1 nucleotide internal loops (no consideration of closing base pairs)

From: Analysis of secondary structural elements in human microRNA hairpin precursors

Z‐score G/G A/C C/A U/U U/C C/U A/A C/C G/A A/G
G/G 0.00 1.26 1.47 1.56 4.67 5.70 8.46 9.42 9.42 10.43
A/C −1.26 0.00 0.22 0.30 3.42 4.46 7.25 8.23 8.23 9.26
C/A −1.47 −0.22 0.00 0.09 3.21 4.25 7.04 8.03 8.03 9.06
U/U 1.56 −0.30 −0.09 0.00 3.12 4.17 6.96 7.95 7.95 8.98
U/C −4.67 −3.42 −3.21 −3.12 0.00 1.05 3.90 4.92 4.92 5.99
C/U 5.70 −4.46 −4.25 −4.17 −1.05 0.00 2.86 3.89 3.89 4.97
A/A −8.46 −7.25 −7.04 −6.96 −3.90 −2.86 0.00 1.04 1.04 2.15
C/C −9.42 −8.23 −8.03 −7.95 −4.92 −3.89 −1.04 0.00 0.00 1.11
G/A −9.42 −8.23 −8.03 −7.95 −4.92 −3.89 −1.04 0.00 0.00 1.11
A/G −10.43 −9.26 −9.06 −8.98 −5.99 −4.97 −2.15 −1.11 −1.11 0.00