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(a) Reaction of styrene with EDA to produce cyclopropane compounds (“cPr”), stereoisomers of 1-carboxyethyl-2-phenylcyclopropane. (b) A guanine base quartet. (c) Heme. (d) Schematic diagram showing a parallel-stranded intramolecular GQ DNA (GQ) complexed with heme. The blue rectangles represent guanine-quartets, and the red square a heme molecule end-stacked on a terminal G-quartet.
