TABLE 1.

Different CYP families induced by different chemical inducers (19).

Inducer	Source of inducer	Cyp subfamily induced
Nonhalogenated polycyclic aromatic hydrocarbons	Petroleum derivatives and coal-tar constituents	CYP1A
Polyhalogenated aromatic hydrocarbons dioxins	Forest fires, volcano activities, industrial processes, waste incretion	Predominately CYP1A or predominately CYP2B or mixed
DDT, dieldrin, chlordane, and mirex	Chlorinated hydrocarbon pesticides	CYP2B and to a lesser extent the CYP3A

CYP - cytochrome P450; DDT - dichlorodiphenyltrichloroethane