Contact number
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Contact number is a simple solvent exposure
Solvent exposure
The solvent exposure of an amino acid in a protein measures to what extent theamino acid is accessible to the solvent surrounding the protein. Generally speaking, hydrophobic amino acids will be buried inside the protein and thus shielded from the solvent, while hydrophilic amino acids will be...

 measure that measures residue
Amino acid
Amino acids are molecules containing an amine group, a carboxylic acid group and a side-chain that varies between different amino acids. The key elements of an amino acid are carbon, hydrogen, oxygen, and nitrogen...

 burial in proteins. The definition of CN varies between authors, but is generally defined as the number of either C or C atoms with in 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.
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