H-L curve: A Novel 2D Graphical Representation of Protein Sequences

According to the partial order constructed on a selected pair of physico-chemical properties of amino acids, we presented a novel 2D graphical representation of protein sequences which is called an H-L curve. The representations are mathematically proven to be no circuit (i.e., without any degeneracy), and associated with protein sequences in a one-to-one manner. In addition, our graphical curves allow more conveniently a visual inspection of protein sequences alignment. We illustrated our approach on two examples.