Both soluble
Fms-like tyrosine kinase 1 (sFlt-1), an endogenous inhibitor of vascular
endothelial growth factor and placental growth factor signalling, and
soluble endoglin (sEng), a circulating co-receptor of transforming
growth factor-b, have been shown to be increased in the serum of preeclamptic
women, when compared with normal pregnancy.