
Different A-patch architectures of size (2,2). (A) A-patch formed by a stack of consecutive adenines, SSU rRNA (PDB ID: 6QZP, chain S2, A-minors: A996|C674-[A2M]1031, A997|G673–C1032) (B) A-patch formed by a cross-strand adenine stack, LSU rRNA (PDB ID: 5TBW, chain 1, A-minors: A2696|C2630–G2648, A2758|U2629–A2649).










