Welcome to the modern era of induced pluripotent stem cells. 2012 Nobel Prize With just a little cocktail, usually of transcription factors, you can make one type of cell turn into another. usually, you will convert it to a less differentiated (cells are created in a sort of tree structure where the leaves are more and more specialized) form, which can then be pushed to develop into other specialized forms.

This is really common in the lab now. You can use them to create organoids which are like mini-organs that have a lot of the properties of, say, a lung or a liver or a stomach or a brain, but aren't a full organism. Very useful for making models of mammalian biology.

By the way the discovery that led to this was a huge surprise (at least, that so few factors were required to transform cells) but there is still very little known, IE we can't arbitrarily convert one cell type to another reliably. Culturing mammalian cells is pretty hard.