In very basic terms, cells are cells. They can’t tell the difference between a petri dish and an animal’s leg. They can’t tell where they are. So if you put them in an environment where they can survive and thrive they’ll grow.
It’s quite a bit more complicated than sticking the cells in a petri dish with a nutrient slurry and heating pad, but that’s the basic premise. You artificially recreate the environment that they normally grow in and they grow. No cow required (except to get the initial cells from in the first place).
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