Using the HSAT2 probes in combination with probes for mouse immune cells (Cd45) or fibroblasts (Fsp-1), we identified HSAT2-positive mouse cells in proximity to areas of tumor beds, while mouse epithelial cells and more distant Fsp-1+ fibroblasts in adjacent normal kidney tissues were negative (Figure 6, E and F). Here, S100A4 is linked to neoplasm.