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Ogeneous cell populations. We showed here that all three of ZK cell lines responded in a manner comparable to that of primary murine alveolar macrophages. Morphologically, they are alveolar macrophage-like with Diff Quik, a modified Wright staining (Fig. 3). They all highly expressed macrophage antigens, F4/80 and CD11b on cell surfaces by immunofluorescent staining and flow cytometry assays (Fig.