Problems in using FFT versus DFT in the resonant recognition model

Proteins are linear macromolecules built up of sequentially linked amino acids. Both protein function and their active 3D structure are determined by the sequence of amino acids. Although a lot of protein sequences and their functions and structures are already known the critical problem of how functional information is written within the sequence still remains. The RRM analyses these linear sequences transforming them into the frequency domain using Fourier Transform. Although FFT was generally used, problems were found, in some cases. Here, the authors compare and discuss results obtained using FFT and DFT for the same groups of proteins