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. A: RNA sequence CRW_00001 of subclass 4A with pseudoknot pattern ABCDEFEGCGHIAIJKBKFJHD. B: RNA sequence CRW_00521 of subclass 4B with pseudoknot pattern ABACDEFGHEGIHJKJFILBLDKC. (Stem color, blue: major stem; green: intermediate stem; red: minor stem).
