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. 2015 May 4;43(10):4785–4799. doi: 10.1093/nar/gkv427

Table 6. Occurrence of each pucker conformation in non-type-1 loops.

C1’-endo C2’-endo C3’-endo C1’-exo C2’-exo C3’-exo C4’-exo O4’-endo % C2’-endo for non-type-1 loops % C2’-endo for type-1 loops
T 1 9 2 1 0 2 1 1 52.9% (9/17) 23.1% (6/26)
T 0 10 3 2 1 1 0 0 58.8% (10/17) 0.0% (0/26)
A 0 8 0 6 0 0 2 1 47.1% (8/17) 88.5% (23/26)

There is a pronounced shift towards C2’-endo puckering for all residues of the TTA loops for non-type-1 loops when compared to type-1 loops (highlighted in bold).