Stem cells that express specific cell markers, such as NOTCH1 [12,13], CD117 [14], OCT-4 [15], Musashi-1 [16], SUSD2, N-cadherin or SSEA-1 [7], have been found in the eutopic endometrium of patients with endometriosis and adenomyosis. The gene discussed is KIT; the disease is endometriosis.