Influenza (the flu) is caused by a virus that attacks the respiratory system. Which type of gene is most likely to be widely expressed in the body of someone who contracts the influenza virus?

Influenza infects the respiratory system, so the body responds by activating immune defenses. A gene involved in producing white blood cells is most likely to be expressed as the body makes cells that help fight the virus. Genes for skin cells and red blood cells do not directly address the infection.

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