Contact number

see also Kissing number in the sphere packing problem

In chemistry, a contact number (CN) is a simple solvent exposure measure that measures residue burial in proteins.[1] The definition of CN varies between authors, but is generally defined as the number of either C or C atoms within a sphere around the C or C atom of the residue. The radius of the sphere is typically chosen to be between 8 and 14Å.

See also

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