Immortalized Cells.
https://www.igor-chudov.com/p/lab-grown-meat-is-made-of-cancer
https://www.sciencedirect.com/topics/neuroscience/immortalised-cell-line
“The major disadvantage to using immortalized cells is that these cells cannot be considered “normal,” in that they divide indefinitely and sometimes express unique gene patterns not found in any cell type in vivo. Therefore, they might not have the relevant attributes or functions of typical cells. Also, after several passages, cell characteristics can change and become even more different from those of a normal cell.”