Genetic Toxicology of Complex Mixtures W. Vogel & M. Büttner GmbH The conference participants were able 53 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 Huntington's disease and some other neurological disorders 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 The emphasis of presentations on exposures effects assessment was on integrated quantitative evaluation of human exposure and potential health effects