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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
A plot of density versus mass for a range of proteins of various sizes. Blue: van der Waals radius. Green: Etch radius. Red: Experimentally desired result from Equation (A7).