plasmids containing cdnas for human interferon ( ifn ) alpha-1 , ifn alpha-2 , and several hybrids of the two cdnas , all joined identically to an escherichia coli lac promoter fragment gave rise , in e. coli , to fused interferons ( fifns ) that had very different target-cell specificities .
C0021734
ifn alpha-2
C0021747
interferons