Fig. 2From: Analysis of secondary structural elementsĀ in human microRNA hairpin precursorsDiagrams of bulge and internal loops that have the same motifs but different orientations in miRNA hairpin precursor secondary structure (aād), and a multibranch loop motif (e). (a) 5ā bulge loop (AU)U/-(GC), (b) 3ā bulge loop (CG)-/U(UA), (c) internal loop (CG)C/A(UA), (d) internal loop (AU)A/C(GC), and (e) multibranch loop (CG)A(GU)U(GC)C(GC). The motifs can be characterized by the identity of unpaired nucleotides (red letters) or the identity of unpaired nucleotides and closing base pairs (red and black letters). Note: (AU)U/-(GC) and (AU)-/U(GC) are different motifs. The equivalent 3ā bulge for the 5ā bulge (AU)U/- (GC) is (CG) -/U(UA)Back to article page