A crystal structure was obtained for the self-complementary RNA duplex (5′-GGUGGCUGUU-3′)2 at a resolution of 1.32
Å resolution with Rfree and Rwork values of 0.1857 and 0.1569, respectively. The crystallographic and refinement statistics are summarized in Tables 2 and 3. The crystals in question presented an interesting crystallography challenge because
there are five RNA strands in the asymmetric unit, rather than the even number that have been anticipated