Recent evidence has shown that humans metabolize benzene more efficiently at environmental air concentrations than at concentrations > 1 ppm. This led the researchers to speculate that an unidentified metabolic pathway was mainly responsible for benzene metabolism at ambient levels. They statistically tested whether human metabolism of benzene is better fitted by a kinetic model having two pathways rather than one.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/evidence-humans-metabolize-benzene-two-pathways
[2] http://admin.indiaenvironmentportal.org.in/category/author/stephen-m-rappaport
[3] http://admin.indiaenvironmentportal.org.in/category/author/sungkyoon-kim
[4] http://admin.indiaenvironmentportal.org.in/category/author/qing-lan-et-al
[5] http://admin.indiaenvironmentportal.org.in/category/journal/environmental-health-perspectives
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/benzene
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cancer
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health