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In situ terminal deoxynucleotidyl transferase dUTP nick end labelling (TUNEL) staining of chicken embryo tracheal organ cultures (TOCs) infected with (A) 885, (B) QX (C) M41 or (D) mock infected at 24 hpi (hours post-infection). Apoptosis TUNEL staining of TOCs infected with IBVs showing multiple apoptotic cells with degeneration and loss of cilia. Arrows indicate apoptotic cells.
