Figure 3
From: Protein surface representation and analysis by dimension reduction
Illustration of different protein surface definitions: A van der Waals surface (cyan) is obtained by taking the union of the spherical atom surfaces defined by the van der Waals radius of each atom. Solvent accessible surface (pink) is defined by the path traced by the center of a probe (yellow) that is rolled around the protein. Molecular surface (solvent-excluded surface) is the set of points traced by the inward-facing part of the probe.