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Recent results from J Lee Nelson and colleagues (Sci Am. 2008 Feb;298(2):64-71; available as full text through Google) show that cells from the mother were found in a person aged 46. Logically, these cells should be stem cells, as any other cells would die in such a long period of time. So, what stem cells could be transferred from mother to fetus? Why doesn't the immune system reject those cells?

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Please add a full reference and link to the paper. – fileunderwater Jun 6 '13 at 10:44
They could also be immune system memory cells, as they are (by necessity) extremely long-lived – MattDMo Jun 6 '13 at 13:38
Yes, a link to the reference would be most helpful. In the meantime, I found some abstract from a conference where they apparently presented this work here: Chimeric maternal cells as T lymphocyte targets in pediatric SLE – Steve Lianoglou Jun 6 '13 at 15:21
Please don't include articles directly into your posts, firstly it's huge and makes your question pretty much impossible to read but also it's very very close to plagiarism and copyright circumvention. Usually linking to a pubmed index or the journal itself will suffice along with fairly quoting any relevant sections. – Rory M Jun 6 '13 at 18:53

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