Not a dumb question at all. The difficulty with cells from multicellular organisms is that they are used to be part of a larger organism. Isolating individual c

Not a dumb question at all. The difficulty with cells from multicellular organisms is that they are used to be part of a larger organism. Isolating individual cells and keeping them alive is very difficult. The oldest cultured human cell line are HeLa cells[1] which are derived from cervical cancer cells and they are therefore not normal human cells. Cancer evolves to be resilient and is therefore easier to cultivate than regular well-behaving cells. [1] https://en.wikipedia.org/wiki/HeLa https://en.wikipedia.org/wiki/HeLa