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(a) Conserved sequences of three base pairs at the branching point of 2G–C and 3G–C junction. The sequences at the branching point of 2G–C junction were conserved in clones 3, 5, 9, 10, 14 and 17, while those of 3G–C junctions were conserved in clones 1, 4, 6, 8, 11, 12, 13, 15 and 16. (b) Sequences of three base pairs flanking the junctions of ch9-48 and ch16-40. Line drawings denote stem and loop regions.
