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Immunogold labeling using MAbs reacting with both the HRSV F and BRSV F protein (MAb 2F; A, C, E) or exclusively with the HRSV F protein (MAb 44F; B, D, F). Labeling was performed on preparations of rBRSV (A, B), rBRSV/A2 (C, D), and HRSV Long (E, F). Bar, 150 nm.
