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Inverted images of PDGF-Rβ+ vascular-associated cells in the rat lung after breathing high oxygen. (a) Endothelial cell (EC) and intermediate cell (IC) at D7; (b) mesenchymal cell, that is, fibroblast (FB) at D7. Note the condensation of heterochromatin at the edge of the nucleus. Original magnification: (a) ×19,636; (b) ×12,480.
