<i>Osterix</i>-Cre Fate Mapping Marks Bone Marrow Perivascular Stromal Cells.

<p>Immunostaining for the endothelial cell marker, CD31 revealed that <i>OEC</i> (<b>A–C1</b>) and <i>ORt</i> (<b>D–F</b>) fate mapping does not result in Cre reporter expression in endothelial cells, but in a perivascular stromal cell population associated with vascular sinuses of the bone marrow. (<b>A, A1,</b> and <b>D</b>) Cre reporter expression (shown in red). (<b>B, B1,</b> and <b>E</b>) CD31 immunostaining (shown in green). (<b>C, C1,</b> and <b>F</b>) Overlay showing association of Cre reporter expressing cells with bone marrow vasculature.