I called AMGEN to find out where they are performing their human trials of GDNF which was promising in helping relieve some of the symptoms (slowness, stiffness,rigidity)of PD in tests on primates. They will not release that information, however, they said that they are being held at centers that specialize in pallidotomies. Write-up available in NATURE 3/21/96 issue Vol. 380 pg. 255 for those interested. Anyone with further information on the AMGEN trials, please post. Father-in-law (81) has been fighting PD for 12 years. Thanks, Richard Fagin