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Marty Rose asked for information on GDNF. GDNF is the shorthand term for Glial-cell-line Derived Neurotropic Factor. This is one of the small proteins called peptides. Proteins are very large molecules and the first order of business in digesting them, for example, is to break protein apart into the smaller and smaller units called proteoses and peptides. When completely broken down, the result is a bunch of amino acids. Amino acids from digested food are also reassembled in our bodies into new protein products, as needed, and where needed. Some of these products include the peptides called neurotropic factors. These act to protect, and sometimes regenerate nerve tissue. Currently, there is a great deal of interest and research that is focused on this particular neurotropic factor, GDNF, because it seems to protect dopamine producing cells, and also spinal cord motor neurons. If trials prove to be successful, the benefits for PD, ALS, and similar neurological problems could be enormous (and profitable.) A good reference is the January 26, 1995 issue of NATURE. A Yahoo or Lycos or other search engine for GDNF will turn up many more sources, some in exceedingly technical language, but others more readable. Hope this helps! Martha