Assertion: acetaldehyde's effect | /r/AtLocation | the site of first contact
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Source sentences:
text: Also, though intermediary metabolism and ingestion of alcoholic beverages contribute to levels of acetaldehyde in the body, critical effects of exposure to exogenous acetaldehyde, based on studies in animals, occur at the site of first contact (i.e., the respiratory tract following inhalation and the gastrointestinal tract following ingestion).