The more than 40 oncogenic retroviruses that have been identified share expression of all of the following genes except

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The src gene is not universally expressed by all oncogenic retroviruses; it is specific to certain viruses and is associated with their ability to transform cells. The pol, env, and gag genes, on the other hand, are essential for the basic structure and life cycle of all retroviruses, including those that are oncogenic.

The More Than 40 Oncogenic Retroviruses That Have Been Identified