Abstract
To follow the fate of exogenously introduced immune complexes in the rabbit lung, a direct labeling method was devised. Bovine serum albumin was incubated with fluorescein isothiocyanate, washed and then bound at equivalence with antibovine serum albumin. Immune complexes thus prepared are injected into a rabbit airway and the animal was sacrificed. Using chilled alcohol fixative and paraffin embedding 4 ωm sections were prepared for light and fluorescent microscopy. This technique readily verifies that labeled antigen is taken up by alveolar macrophages. Electron microscopy using ferritin-antiferritin complexes corroborate these light findings.
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