passages.id: split_5_test_2489_passage
passages.type: progene_text
passages.text: The antigenic properties of hybrid IFNs consisting of the N - terminal portion ( 1 - 75 ) of IFN-alpha21a and the C - terminal portion ( 76 - 166 ) of IFN-alpha2c were analyzed with mAb recognizing defined regions of IFN-alpha2c , IFN-alpha1 , and IFN-alpha8 / 1 / 8 .