Changes

==Identification==

==Identification==

Laboratory studies are the primary source for identifying carcinogens.  In these studies, it is assumed that if a large dose (usually higher than common human exposure)of a substance causes cancer in cell cultures or animals it will also cause cancer in humans.<ref name="ACS"/>

Laboratory studies are the primary source for identifying carcinogens.  In these studies, it is assumed that if a large dose (usually higher than common human exposure) of a substance causes cancer in cell cultures or animals it will also cause cancer in humans.<ref name="ACS"/>

[[Epidemiology|Epidemiologic studies]] are another importance source of information about carcinogens.  These focus on the interactions of human populations with the substances found in their environments.  It is difficult to identify carcinogens through these studies because of their uncontrolled nature, but they aid scientists in making educated assessments of the cancer-causing ability of suspected carcinogens.<ref name="ACS"/>

[[Epidemiology|Epidemiologic studies]] are another importance source of information about carcinogens.  These focus on the interactions of human populations with the substances found in their environments.  It is difficult to identify carcinogens through these studies because of their uncontrolled nature, but they aid scientists in making educated assessments of the cancer-causing ability of suspected carcinogens.<ref name="ACS"/>