Each dot is linked to the next dot by a slanting line segment (link) and each cis-peptide bond (omega approximately 0 degrees) between residues X and Y is indicated by marking dots psi X and phi Y with a diamond. For each residue in sequence, phi and psi are plotted as dots on the y-axis above the next two points on the x-axis representing the residue number.
A new graphic method is described for presenting in two dimensions the phi and psi dihedral angles that describe the backbone conformation of a peptide or protein chain.
