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It is fascinating to learn about apoptosis and the fact that cells are able to destroy themselves without any external influence. Sal creates interest in the huge number of cells and the complexity of the human body. The likelihood of a mutation causing a problem is small, and that mutation would have to be within the genes controlling self-destruction and replication. The lecture continues with details of tumor growth and the differences between malignant, benign, invasive, and metastases.
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