RECOGNITION A polyamide dimer containing four pairs of rings (Im/Py, Hp/Py, Py/Hp, and Py/Im, where Im = imidazole, Py = pyrrole, and Hp = hydroxypyrrole) can read the minor groove of the DNA double helix and distinguish each of the Watson-Crick pairs, G-C, T-A, A-T, and C-G.
COURTESY OF PETER DERVAN
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