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Thus, while acute exposure to PG- and GLY-containing e-cigarette aerosols may not cause significant pulmonary function changes, chronic exposure scenarios warrant investigation

NARRATOR: 36 years earlier, Jefferson had himself tried to have slavery forever barred from any new western territories

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It refers to changes of genetic expression, while without changes of DNA sequence

He has worked in the domestic, commercial, industrial, high-purity and sterile water treatment arenas