|We use a very simple two-dimensional protein model: each amino acid is represented by a round particle, and each peptide bond between two adjacent amino acids is represented by a spring. The particles can interact with each other through van der Waals forces and electrostatic forces. To observe exclusively the effect of charges, the "protein" is put in vacuum. The folding behavior will be different if the "protein" is put into water or oil, because the electrostatic interactions will be screened by the surrounding solvent molecules.|
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