(B–I) Flow cytometry analysis and fluorescence images of primary tumors showing presence of TdTOSX+ cells in no-doxy fed Osx-cre;TdT mice or WT;TdT controls inoculated with B16-F10 melanoma subcutaneously (B–C), or with PyMT breast cancer cells in the mammary fat pad (MFP) (D–E), and in doxy-fed mice injected with B16-F10 subcutaneously (F–G), or with PyMT in the MFP (H–I). Here, SP7 is linked to breast carcinoma.