Pericyte marker alpha smooth muscle actin (α-SMA, red) and vascular endothelial growth factor receptor-2 (VEGFR-2, green) double immunofluorescence staining was shown in Ewing’s sarcoma tumors. The yellow area indicates cells that express both VEGFR-2 and α-SMA. For further details, please see Zhou and associates 4867 in this issue.