A weak signal for strong responses: interferon-alpha/beta revisited

Biological systems have acquired adaptability and robustness against rapid environmental changes. A typical example is the immune system, which eradicates invading pathogens such as viruses. Interferons α and β, which are produced in response to viral infection, are essential components of this system but are also produced at low levels in the absence of infection. What is the purpose of the constitutive weak interferon-α/β signal?

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