In vitro proliferation of murine AM after infection withAdmGM-CSF. AM were plated on cell locator dishes and infected with AdmGM-CSF or AdNull, each at 200 moi. The AM were fixed 96 hours later, and the nuclei were stained with DAPI and evaluated using fluorescence microscopy. (A) AdNull. (B) AdmGM-CSF; note the marked increase in the number of cells. Arrows indicate mitotic figures. (C) AdmGM-CSF, mitotic figures from (B) shown at higher magnification. Bar = 50 μm for (A) and (B); bar = 5 μm for (C).