may I suggest that a trip through the archives using Simon Coles' search system and these 2 key words together < Bonander> and <Carbidopa> would be a good first step. I read PIEN online and have no problem in finding and using this search. It can be found in the introduction section at the top of the page. For those who read PIEN inother modes.......... sorry I can't help Anne Rutherford ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn