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Electrostatic fields created by IL-2Rα (A) or SP4206 (B). Interfacial atoms (within 5.3 Å of any IL-2 atom) for both binding partners are shown on the left in stick view. The electrostatic fields created by the ligands in the complexed structures are shown on the right. Blue is positive and red is negative, shown at isopotential levels of ±6 kBT/ec at T = 310 K (ec, electron charge). Note the more localized electrostatic field presented by the small molecule.
