"Figure 2: Possible scenarios underlying insufficient feminization. During normal feminization, sufficient estrogen is present in the fetal environment. The estrogen is recognized by fetal cells and triggers the development of a female fetus. In Scenario 1, very little estrogen is present in the fetal environment. Even though the fetal cells are capable of sensing estrogen, very little enters the fetal environment and the fetus is insufficiently feminized. In Scenario 2, there is enough estrogen in the fetal environment, but fetal cells are effectively ""deaf"" to the estrogen and the fetus is insufficiently feminized."