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Inhibition of IFN-gamma-dependent antiviral airway epithelial defense by cigarette smoke

Blood, blood plasma, and blood components collected for the purpose of blood transfusion or the preparation of blood products and sent for testing as part of the collection process, except where the person collecting the blood has reason to believe it contains a Category B infectious substance, in which case the test sample must be shipped as a Category B infectious substance

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After a 4-day rest period during which cells were cultured in complete culture medium, cells were again stimulated, and this process was repeated weekly for a maximum of 6 months