HLA-E is expressed on trophoblast and interacts with CD94/NKGs receptors on decidual NK cells. - King,A.; Allan,D.S.; Bowen,M.; Powis,S.J.; Joseph,S.; Verma,S.; Hiby,S.E.; McMichael,A.J.; Loke,Y.W.; Braud,V.M. (Eur J Immunol, 2000)