> It is known that inside the ventricles of the brain are Cuando algo comienza asi y no le ponen ninguna referencia bibliografica .... yo paro la lectura. serge Ph.D., Postdoctoral Research Associate Department of Chemical Engineering & Materials Science University of California, Davis, CA USA 95616-8598 email (internet) sbobroff en ucdavis.edu telephone 916-752-5364 fax 916-752-4759