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. Author manuscript; available in PMC: 2013 Feb 1.
Published in final edited form as: Biomaterials. 2011 Nov 14;33(5):1201–1237. doi: 10.1016/j.biomaterials.2011.10.059

Figure 3.

Figure 3

Core-shell model of a hydrated spherical protein with hydrated radius R that is 1.3X larger than the packed amino-acid core with radius rv , creating an excluded diameter 2R. The packed radius scales as MW1/3 so that protein volume scales directly with MW. The hydration shell surrounding a polyelectrolyte protein is an osmolaric barrier to physical contact between two proteins.