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. A: RNA sequence CRW_00474 of subclass 2A with pseudoknot pattern ABCACDBD. B: RNA sequence PDB_00335 of subclass 2B with pseudoknot pattern ABCDCADB. C: RNA sequence ASE_00204 of subclass 2C with pseudoknot pattern ABCDEDBCAE. D: RNA sequence PDB_00187 of subclass 2D with pseudoknot pattern ABCBDEDCAFEF. (Stem color, blue: major stem; green: intermediate stem; red: minor stem).
