Figure 2: Schematic representation of the structures and space-filled models of methionine (a) and MeHg-Cys complex (b). Note the similarities in chemical structure between the MeHg-Cys conjugate and the amino acid methionine. The geometry-optimized using Universal Force Field (UFF). The representations (ball and stick, Vander Waals spheres) were obtained using the program PyMOL (Molecular Graphics System, Version, Schrödinger LLC).