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'No one knows what they are': Researchers discover new type of cell that's seen only during pregnancy: A new map of the "maternal-fetal interface" reveals a new type of cell, as well as the types of cells most likely to be affected in conditions like preeclampsia.

A new map of the "maternal-fetal interface" reveals a new type of cell, as well as the types of cells most likely to be affected in conditions like preeclampsia.

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