Three months after induction of endometriosis, SSEA1 expression increased in the eutopic endometrial basalis in 4/6 (67%) of the animals but unlike normal human basalis glands, only a very few discreet SSEA1 expressing cells were observed in the eutopic endometrial basalis of the control baboons (Fig. 2A). The gene discussed is FUT4; the disease is endometriosis.