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Characterization and Source Apportionment of PM2.5 in an Urban Environment in Beijing

Ethics declarations Ethics approval and consent to participate The study was approved by the Ethics Committee of the Institute of Basic Medical Sciences of the Chinese Academy of Medical Sciences (0282013), and all participants written informed consent

Hard Pack Freshness Protection: Rigid box packaging ensures factory-fresh tobacco from the first to the last cigarette

Minnesota and the Twin Cities sue the federal government to stop the immigration crackdown Read full article: Minnesota and the Twin Cities sue the federal government to stop the immigration crackdown The state of Minnesota and the Twin Cities of Minneapolis and St

Next, we examined bronchial epithelial cell proliferation by immunostaining for Ki67, a cell cycle marker, and found that ECE exposure displayed no obvious differences in numbers of proliferating basal cells or pan-epithelial cells from healthy nonsmokers or COPD smokers (supplementary figure S4a-d andS5a-d)