Figure 3

Immunohistochemical staining for OCT-4. OCT-4 = Octamer-4; (A) OCT-4 overexpression in a sample of follicular phase endometrium. The picture demonstrates selected tissue compartments, ie three endometrial glands and surrounding endometrial stroma The brown staining shows OCT-4 expression in the cytosol of glandular cells. Magnification ×100. (B) OCT-4 overexpression in a sample of luteal phase endometrium. The picture demonstrates selected tissue compartments, ie two secretory endometrial glands and surrounding endometrial stroma The brown staining shows OCT-4 expression in the cytosol of glandular cells. Magnification ×200. (C) OCT-4 overexpression in a sample of embryonic carcinoma of the testis serving as positive control. Magnification ×200. (D) Section of embryonic carcinoma of the testis stained with IgG1 as described in Materials and Methods serving as negative control. Magnification ×200.