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. 2022 Aug 19;27(16):5287. doi: 10.3390/molecules27165287

Figure 1.

Figure 1

Schemes of the different homotetrads discussed in the text. (A) G-tetrads in their two possible orientations (clockwise and anticlokwise); (B) The three most common A-tetrads; (C–E) C-, T-, and U-homotetrads, respectively.