SOX2 and breast cancer: Normal positive staining patterns for OCT4 (Figure S2A in Supplementary Material, brown), NANOG (Figure S2B in Supplementary Material, purple), SOX2 (Figure S2C in Supplementary Material, brown), c-Myc (Figure S2D in Supplementary Material, brown), and KLF4 (Figure S2E in Supplementary Material, purple) were demonstrated on human seminoma, normal skin, breast cancer, and prostate tissues, respectively.