In a cell culture you notice that a group of cells have begun to form a focus on a culture dish. These cells are most likely ______.

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Formation of a focus, or a clustered group of cells, is a common characteristic of transformed or cancerous cells in cell culture. Normal, healthy cells typically grow in a monolayer and do not form foci. Therefore, the most likely option in this scenario is that the cells forming a focus are malignant.

In a Cell Culture You Notice That a Group of Cells