IF staining of a lung section from the MMTV-PyMT mouse in Figure 4. DAPI (blue), VEGFR2 (red) and PyMT (green). (A1-A3) Sections containing a metastasis with a diameter of approximately 1 mm. (B1-B3) Magnification of the corresponding area indicated with a square in (A). (B3) Red and yellow arrows indicate metastasis and normal lung tissue, respectively. The border between the tissues is outlined in white.