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Complementarity of electrostatic potentials at the interface of the colicin E3 RNase domain–Im3 complex (PDB entry 1e44). Positive potential is shown as blue and negative potential is shown as red. (A) Colicin E3 RNase domain, which has mostly positive electrostatic potential facing Im3. (B) Im3, which has mostly negative potential facing the RNase domain.
