Many different mechanisms have been reported for preeclampsia and they are listed here. NK cell, natural killer cell; 2-ME, 2-methoxyestradiol; HIFs, hypoxia-inducible factors; AT(1)-AAs, auto-antibodies for angiotensin receptor type I; VEGF, vascular endothelial growth factor; sEndoglin, soluble endoglin; sFlt1, soluble Fms-like tyrosine kinase-1.