Table 2. The number of RNA structures in exonic, intronic, and mixed regions by free energy groups (15–20, 20–25, 25–30, and >30 kcal/mol, by absolute value).

Class	15–20	20–25	25–30	>30
Exonic	2,055 (56%)	989 (27%)	420 (11%)	212 (6%)
Intronic	3,189 (45%)	1,949 (27%)	1,042 (15%)	952 (13%)
Mixed	570 (48%)	349 (29%)	165 (14%)	106 (9%)