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The presence of water is characteristic to all biological systems. For any simulational study of biophysical phenomena, a proper description of water is a necessity, and the differences among commonly used water models are nowadays known from systematic studies. In addition to water, the description ions, in particular Na+ and Cl-, is essential for biophysical systems. A simple example is the physiological liquid in the human body containing about 0.8 mol salt, i.e., of the order of one ion pair per 100 water molecules. The differences among the models for the ions that have been proposed so far, are much larger than the differences between the water models.
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