CTNNB1 and neoplasm: The results of the immunohistochemical staining of the original tumor and formed after BSC8 cells injection under the skin of an immunodeficient mouse withantibody CK-20; beta-catenin; CDX2; ALDH (data not shown) were similar, the intestinal origin of the tumor regeneraated in the mouse is not in doubt (Figure 5, Supplementary Figure S4).