
Keywords: H & E; 12; 15; BO; bronchiolitis obliterans; DAPI; 4,6-diamidine-2-phenylindole dihydrochloride; G-CSF; granulocyte colony-stimulating factor; GM-CSF; granulocyte macrophage colony-stimulating factor; H&E; hematoxylin and eosin; HPF; high-power field; HTT; heter