Have just posted (apparently for the first time, tho I could have sworn I had listed them) 2 sites. Am so sorry. Will do so again here: http://neuro-chief-e.mgh.harvard.edu/parkinsonsweb/Main/Chap14.html and http://neuro-chief-e.mgh.harvard.edu/parkinsonsweb/Main/News/gene.html Barb Brock