Natural killer (NK) cells, originally so named because they have the capacity to kill other cells without activation, can be licensed and educated to regulate tissue homeostasis. This notion has recently been shown in reproduction—in both normal physiology by Hanna et al. and severe pathophysiology (preeclampsia) by Hiby et al.
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Karimi, K., Blois, S. & Arck, P. The upside of natural killers. Nat Med 14, 1184–1185 (2008). https://doi.org/10.1038/nm1108-1184
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DOI: https://doi.org/10.1038/nm1108-1184