Bovine foetal trachea. Derived from the trachea of a male bovine foetus. The cell line can be used for isolation, replication and quantitation of BVDV, IBRV and parainfluenza type 3 virus. Growth and morphological characteristics decline beyond passage n. Tumorigenecity: Isoenzyme: Histopathology: normalSubculture: Split ratio: Media change: Reverse transcritase: negativeProduction.