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Electrostatic surface representation of tetrapeptide agonist Ac-His-(pI)DPhe-Arg-Trp-NH2 analogue 14 (A) and antagonists tetrapeptides 15–19 (B–F) of MC3 receptor colored by calculated charge from red (−15kT/e) to blue (+15kT/e) using the dielectric constant of 10. Poisson–Boltzmann electrostatic was calculated using the APBS program implemented in PyMOL.
