passages.id: split_5_test_2486_passage
passages.type: progene_text
passages.text: We compared the antigenic properties of human interferon-alpha2c ( IFN-alpha2c ) , IFN-alpha21a , hybrids IFN-alpha21a / alpha2c , and their mutants , using a panel of 27 anti - IFN-alpha1 , anti - IFN-alpha2 , and anti - IFN-alpha8 / 1 / 8 monoclonal antibodies ( mAb ) .