Macrophage lineage antigen expression in 32D cells induced to synthesize p19. A p19-inducible 32D subclone grown in IL-3 plus zinc for 4 days was stained with fluorescent antibodies directed to MAC-1 (A), MAC-3 (B), CD14 (C), and F4/80 (D) as detected by flow cytometry. The staining profiles of parental 32D cells (solid line) and of clone 2C cells grown in the absence (dotted line) or presence (bold line) of zinc are indicated in each panel.