Using artificial intelligence, scientists have created a tool that lets anyone visualize what the structures inside a cell look like -- even when you only have images of the outside. The Allen Integrated Cell, available for free online, creates 3D visualizations that could help researchers better understand disease. This cell tool focuses on human stem cells, or cells that haven't yet turned into, say, muscle cells or heart cells. If we better understand the inner workings of a healthy cell, then we can better understand what goes wrong when it turns into something like a cancer cell, says Greg Johnson, a scientist at the Allen Institute. "This can help us'roll back in time' from a cancer cell to observe the changes that are happening, and detect them as early as possible," he adds.