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As shown in Figure 3 , comparisons of the gene expression responses of the collective enediynes to γ - radiation identify four primary sectors : ( I ) those that were similarly induced upon exposure to enediynes and γ - radiation ; ( II ) those that were induced upon exposure to γ - radiation but repressed upon exposure to enediynes ; ( III ) those that were similarly repressed upon exposure to enediynes and γ - radiation ; and ( IV ) those that were repressed upon exposure to γ - radiation and induced by enediynes ( Figure 3 ) . Most of the relatively few , recent human cases in this country have resulted from exposures to bats . Many of the harmful effects seen after exposure to gasoline are due to the individual chemicals in the gasoline mixture , such as benzene and lead . Its texture is rough , like coarse blotting paper and although it would originally have been grey , it is now a yellow brown having faded through exposure to the light . In this new sphere of metabolomics , key small molecules ( metabolites ) in the biochemical processes of the body are easily obtained from human subjects in urine , blood , saliva , or tissue samples and can be profiled to establish their normal molecular patterns in the healthy functioning individual , and to detect changes that denote modification and dysfunction of these molecules produced by exposure to environmental agents .