In vitro systems toxicology approach to investigate the effects of repeated cigarette smoke exposure on human buccal and gingival organotypic epithelial tissue cultures.

Toxicol Mech Methods · 2014 · PMC4219813 · PMID 25046638

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a decreasing trendno p-value reported

In addition, our results indicated that CS exposure did not affect the levels of proliferating cells in both tissues as indicated by the proportions of Ki67-stained cells (despite a decreasing trend of Ki67-stained cells upon CS exposure in both tissues).

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