Positive staining was demonstrated in seminoma for Nanog (Image 1A in Supplementary Material, red), OCT4 (Image 1B in Supplementary Material, brown), and SALL4 (Image 1C in Supplementary Material, brown); skin for SOX2 (Image 1D in Supplementary Material, brown); and tonsil for pSTAT3 (Image S1E in Supplementary Material, brown) and CD44 (Image 1F in Supplementary Material, brown). This evidence concerns the gene SOX2 and seminoma.