Interferons (IFN) are critical in inducing the antiviral and antigrowth responses and modulating immune reactions. The antiviral response whose molecular process is being revealed is especially the most concerned function of IFN. The inducing process of IFN is actually a signal transducing and propagating progress. The principle process involves tyrosine phosphorylation and activation of signal transducers and activators of transcription. Then the activated transducers and activators migrate into nucleus to induce the expression of m...