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The fixed samples were then quenched with 50 mM NH 4 Cl in PBS-C/M for 10 min, followed by blocking with PBS-C/M containing 0.5% BSA, 0.5% saponin, and 0.2 mg/ml sodium azide for 30 min
never smoker, light smoker (114), medium smoker (1524), heavy smoker ( 25 cigarettes per day) and former smoker together with presence of cough and phlegm at least 3 days per week for at least 3 months of the year and whether the worker had the lung disease Byssinosis
10.1136/bmjsem-2020-000960 31
Over the past five years, however, cigarette and e-cigarette companies have filed three major lawsuits against the Food and Drug Administration to halt the imposition of rules intended to make their products less appealing to consumersand less accessible to kids