Before revision:  The structural properties we considered include buriedness (  relative solvent accessibility and contact number), structural flexibility (  B factors, root-mean-square fluctuations, and variation in dihedral angles), and variability in designed structures.
After revision:  The structural properties we considered include buriedness ( relative solvent accessibility ), packing density (as measured by contact number), structural flexibility ( B factors, root-mean-square fluctuations, and variation in dihedral angles), and variability in designed structures.