Cancer cells have messed up mitochondria. Transplanting "cancerous" nuclues from one cell to healthy cell did NOT produce cancer. But transplanting cancerous c

Cancer cells have messed up mitochondria. Transplanting "cancerous" nuclues from one cell to healthy cell did NOT produce cancer. But transplanting cancerous cytoplasm (fluid around the cell nucleus that contains mitochondria) DID cause cancer in the healthy cell. Neurons in neurodegenerative diseases also have messed up mitochondria.