these were 1.8 x 10 ( 6 ) units/mg for e. coli-derived ifn-gamma , 2.0 x 10 ( 8 ) units/mg for e. coli-derived ifn-alpha a , and 1.8 x 10 ( 8 ) units/mg for e. coli-derived ifn-alpha 2 .
C0002199
ifn-alpha a
C0021734
ifn-alpha 2