Table 2 Summary of observations on normal (NP) and abnormal placentae (AP) and derived trophoblast cultures: ERα expression in vivo and in vitro, and formation of large syncytial aggregates in late trophoblast cultures under PhR+, PhR-/E2- and PhR-/E2+ conditions.

From: Expression and localization of estrogen receptor-alpha protein in normal and abnormal term placentae and stimulation of trophoblast differentiation by estradiol