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Schemes of the different minor groove tetrads discussed in the text. Direct (A) and slipped (B) minor groove G:C:G:C tetrads. (C) Minor groove C:G:G:C tetrad. Direct (D) and slipped (E) minor groove G:T:G:T tetrads. (F) Slipped minor groove G:C:G:T. Direct minor groove A:T:A:T (G) and G:C:A:T (H) tetrads stabilized by cation coordination (dark circle). (I) Slipped minor groove G:A:G:A tetrad.
