A protein is identified that starts a signal cascade leading to the activation of a gene that promotes cell division. This protein is coded for by a

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Proto-oncogenes are normal genes that, when mutated or expressed at high levels, can lead to uncontrolled cell growth and the development of cancer. The protein identified in the scenario is promoting cell division, which is a characteristic of cancer cells, but it is not necessarily mutated or abnormal. Therefore, it is most likely a proto-oncogene, playing a role in normal cell growth and division that can contribute to cancer development when overactive or mutated. Tumor suppressor genes, on the other hand, act to prevent or slow down cell division, while oncogenes are mutated proto-oncogenes that drive cell proliferation in a cancerous manner. Carcinogens are substances that cause cancer, but they do not code for proteins themselves.

A Protein Is Identified That Starts a Signal Cascade Leading