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Killers become builders during pregnancy

Circulating natural killer cells might be best known for their ability to disable and maim target cells. But in the pregnant uterus of humans these cells seem to have a positive effect, regulating placental development and angiogenesis (pages 1065–1074).

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Figure 1: Human decidual NK cells in the early weeks of pregnancy promote trophoblast cell invasion and vascular growth; figure not to scale.

Kim Caeser

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Le Bouteiller, P., Tabiasco, J. Killers become builders during pregnancy. Nat Med 12, 991–992 (2006). https://doi.org/10.1038/nm0906-991

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