Unformatted text preview: may contribute to defense by stimulating phagocytosis and stopping the growth of many kinds of microorganisms. 3. The third line of defense is a specific or targeted defense. To accomplish this, the immune system must be able to distinguish between its own body cells and intruders. 4. Interferon is a family of proteins produced by cells in response to becoming infected by a virus. The infected cell may die, but its interferon reaches healthy cells in the area, stimulating them to produce proteins that interfere with virus reproduction. Interferon is effective against many viruses and is therefore nonspecific. Interferon seems to be effective against viruses that cause the flu and the common cold....
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- Spring '09