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Bronchial compared with pulmonary circulation
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Structure of vessels
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Expression of adhesion molecules
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Size and hemodynamic characteristics of the site of leukocyte
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emigration
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Structural differences in alveolar walls compared with bronchial walls
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Cell types present
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Anatomy and properties of the extracellular matrix
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Response of structural cells at each site to inflammatory stimuli
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Mediators released (cytokines, chemokines, and others)
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Adhesion molecules expressed and used
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Contribution of biomechanical events
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Stimuli and disease processes affecting alveoli compared with airways
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