Protein Sequence Analysis in GCG
    1.* CoilScan - Locates coiled-coil segments in protein sequences.
    2.* HelicalWheel - plots a peptide sequence as a helical wheel.
    3.  HTHScan    - Scans for helix-turn-helix motif.
    4.* Isoelectric - Plots the charge as a function of pH for peptide sequence.
    5.* Moment - Plots the helical hydrophobic moment of a peptide sequence.
    6.  Motifs - searching through proteins for the patterns defined in the PROSITE.
    7.  PepPlot  - plots protein secondary structure and hydrophobicity in panels.
    8.  PeptideMap - Creates a map of an amino acid sequence.
    9.  PeptideSort - Shows fragments from a digest of an amino acid sequence.
   10.  PeptideStructure - Makes secondary structure predictions for a peptide sequence.
 * 11.  PlotStructure - Plots secondary structure from PeptideStructure output.
   12.  ProfileScan - Uses a database of profiles to find motifs in protein sequences.
   13.  Seg     - Replaces low complexity regions in protein sequences with X characters.
   14.  SPScan  - Scans protein sequences for secretory signal peptides
   15.  Xnu  - Replaces tandem repeats in protein sequences with X characters.