Stabilities of consecutive A.cntdot.C, C.cntdot.C, G.cntdot.G, U.cntdot.C, and U.cntdot.U mismatches in RNA internal loops: evidence for stable hydrogen-bonded U.cntdot.U and C.cntdot.C+ pairs

Abstract
Note: In lieu of an abstract, this is the article's first page.