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Hilary wrote: >I seem to remember that neural cells are different - they are not >replaced, but we are born with the same cells we have till we die - can >anybody back me up? I'm not sure if I can back you up (I don't have any science degrees - just history), but that is certainly my understanding. As we age we lose neural cells and it is often said that eventually everyone will lose a certain percentage of the dopamine-producing cells resulting in Parkinson's. Everyone gets Parkinson's if they live long enough! That has always explained, for me, why for so long Parkinson's was seen as a condition of ageing -- an old person's condition. I find that the consideration now about the inter-relationship of a genetic predisposition and an environmental or some other trigger causing a catastrophic death of these cells (or perhaps turning them off) is a persuasive explanation for the seemingly rising incidence of young onset Parkinson's. TTFN Peter ************************************************************************** Peter Kidd Learning Materials Consulting Services 62 Coronation Avenue, Halifax, Nova Scotia B3N 2M6 Canada Tel/FAX: (902) 443-4262 Email: [log in to unmask] URL: http://www.chebucto.ns.ca/~aa163/peterkidd.html