Vessels and single S1P1 positive cells in the xenograft tumors: Immunohistochemical staining of anti-YKL-40 treated and control tumors for murine S1P1 (as in Figure 6B, right panel).

<p>Asterisks: vessels; arrows: Single S1P1 positive cells (<b>A</b>). Intratumoral bleeding leaves tumor tissue mostly intact: Histochemical Masson-Goldner staining of anti-YKL-40 treated and control tumors. nuclei: brown/black; connective tissue: green; erythrocytes: red (<b>B</b>).