The RRM is based on the premise that proteins with the same biological function or interactive activity have the same periodic components in the distribution of delocalised electron energies along the protein molecule. This has been shown by considering protein as a numerical sequence representing each amino acid in the sequence with a corresponding electron-ion interaction value. This numerical sequence then represents distribution of delocalised electron energies along the molecule. Numerical series obtained in this way can then be transformed into frequency spectra using discrete Fourier transform (DFT) techniques.