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?

When someone contracts influenza, the immune system responds to the viral infection. Genes involved in producing white blood cells are therefore likely to be widely expressed as the body makes and activates cells that help fight the virus. Red blood cells mainly carry oxygen, while skin cells are not central to fighting a respiratory infection.

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