Abstract
Mouse aggregation chimaeras consisting of trisomy 12 and normal euploid cells were produced. The analysis of one trisomy 12↔euploid chimaera, using biochemical and cytological markers, showed that the trisomic cells were able to participate in the formation of most tissues including the ovary. On the other hand, no trisomy 12 cells were found in lymphocyte populations, which is most likely due to early selection in this particular cell lineage. The viability of two adult trisomy 12 chimaeras demonstrates that trisomy 12 cells are able to develop beyond the fetal stage which is not observed in completely trisomic fetuses.
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