Interferon is the protein which interferes with the ability of a virus to be able to replicate inside a host's cell.
Interferon is a type of a protein which is secreted by the host in response to the viruses which the body encounters. They belong to a class of proteins which are known as cytokines.
When a cell gets infected with virus, it releases interferons. The interferons are able to activate the cells of the immune system like macrophages and the natural killer cells This causes the nearby cells to increase their anti-viral defenses. This helps in the protection of unaffected cells from viral infection.
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