If one-third of a rat's brain is comprised of human brain cells, is it still a rat? (Or a ratman?) What if the majority of the rat's brain was comprised of human brain cells? What about the whole thing? Should a ratman have the same moral status as a plain rat? Who decides if ratmen should be created in the first place? These are no longer purely theoretical questions: researchers have successfully implanted human brain cells into the brains of baby rats. Over time, the human cells were integrated into the baby rats' brains and eventually comprised about one-third of total brain mass. This article from MIT Technology Review looks at some of the ethical questions arising from this line of experimentation: www.technologyreview.com/2022/10/14/1061611/rats-with-human-brain-cells
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