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Morphology of primary ATII cells cultured on MgF2 coverslips. Light microscope images of ATII cells stained with osmium tetroxide and tannic acid for the presence of Lbs. Shown are typical staining pictures of cells collected at the (A) early time point (days 3–4), (B) middle time point (days 10–11), and (C) late time point (days 17–18). The dark osmiophilic granules indicate cytoplasmic Lbs. Scale bar, 20 μm.
