Table 5.

Hydrogen-bond free energy increments at 37°C for internal I·C pairs

I·C pairs	$\Delta \Delta G_{\text{HB}}^{°}$
5′-CGCIGAACIGGC-3′	−1.99
5′-CCGICTGTIGCG-3′	−2.05
5′-CGAITCCAITCC-3′	−0.87
5′-CGAITCCTIACC-3′	−1.29
5′-CAAACAAAG-3′	−1.54
5′-CAAAIAAAG-3′	−1.03
5′-CGCIAATTCGCG-3′	−1.74
5′-GTGICTTCIGTC-3′	−2.07
5′-GCATIATCG-3′	−1.70
5′-CGGITCAGITGC-3′	−1.53
5′-GAAICCTAICCG-3′	−1.49
5′-GAAGIACGIAGG-3′	−1.69
5′-CCAIGTGAICCG-3′	−1.28
5′-CCTIGTGTICCG-3′	−2.06
5′-CGTICCATIGGG-3′	−2.06
5′-CCAICTGTICCG-3′	−1.83
5′-CCAIGTGTIGCG-3′	−1.62
5′-CGCITCACITGG-3′	−1.58

The complementary strand is not shown.