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Specific DNA recognition. (A) Superposition of the DNA duplexes in the PspGI-DNA (yellow/orange) and Ecl18kI-DNA (light/dark green) complexes. DNA colors are consistent with Figure 2. Please note the different conformation of the central base pairs in the two structures. Hydrogen bonding interactions between PspGI and the (B) outer and (C) inner C/G pairs of the recognition sequence. The electron density is taken from the original ARP/wARP map and contoured at 1 σ.
