>or using a population of "immortalised" cells, that will keep on dividing. "Which means that you don't kill any animals; you have this immortal cell that can be used forever."
Another term for "immortalised" is cancerous or pre-cancerous. I wonder if in 15-20 years, we will find out that exposure to these artificial meats can lead to cancer?
No, of course not. Intact cells have a really hard time getting into the bloodstream. If they do (say, from handling it with an open wound) the immune system might complain about being bored by such an easy challenge.
Cancers can theoretically be transmitted via transplants, but those derive from humans and are therefore much closer to the body's own cells. And even there, immunosuppressives are required to prevent rejection.
There are some cancers that originate from viruses. HPV is the most prominent, and whatever is killing the Tasmanian Tiger. There's some speculation others may as well (the red meat -> colon cancer link comes to mind). But that's not really relevant for the topic at hand.
Another term for "immortalised" is cancerous or pre-cancerous. I wonder if in 15-20 years, we will find out that exposure to these artificial meats can lead to cancer?