A World Wide Web graphics package has been developed to display the main chain torsion angles phi,psi (Ramachandran angles) in a protein of known structure. This package allows users to find the Ramachandran angles for a particular amino acid type, present in the protein structure. Also, the package calculates the Ramachandran angles at the central residue in the stretch of three amino acids having specified the flanking residue types. In addition to displaying the Ramachandran angles for various options, a detailed analysis output contains the information about the occurrence of the individual amino acid residues at various regions of the plot. This software is incorporated with all the protein structures available in the Protein Data Bank.