Genetic Toxicology of Complex Mixtures W. Vogel & M. Büttner GmbH Huntington's disease and some other van Oystaeyen Huntington's disease and some other neurological disorders The conference participants were able to attend two separate field trips: (I) a pre conference trip guided by Professor Robert Hatcher of the University of Tennessee The emphasis of presentations on exposures effects assessment was on integrated quantitative evaluation of human exposure and potential health effects Source character ization and source apportionment were discussed as an aid to understand ing the origin and relative contribution of various kinds of complex mix tures to the ambient environment