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Higher-order L(S) entanglement in a knot-like fold (PDB ID: 7K16) visualized by RNAspider in (A) full-atom and (B) simplified representation. The red bead indicates the point of puncturing the surface spanned on the loop by the polygonal chain of the 5′-end. The point of intersection falls between the C4′ atom of residue 2 and the P atom of residue 3 of the polygonal chain.
