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Fig. 7. Model of Cts7 and Cts8 function. Spiral artery
remodelling is a concerted action between uterine natural killer (uNK) cells
and trophoblast giant cells. Cts8 endows trophoblast giant cells with
smooth muscle-degrading functions. This activity facilitates endovascular
trophoblast invasion to complete the remodelling process. In addition,
Cts7 and Cts8 may have complementary roles in promoting
differentiation of the spiral artery-associated giant cell subtype from
precursors within the ectoplacental cone.