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

<p><i>OEC</i> (<b>A-i2</b>) and <i>ORt</i> (<b>J–L</b>) activated <i>Ai9</i> Cre reporter expression (red) was observed in perineural cells that formed tubes around nerve fibers (green) located in the bone marrow compartment (A–F and J–L), channels of the cortical bone (g2, h2, i2) and adjacent to the outer periosteum (g1, h1, i1). Nerve fibers were identified by immunostaining for Neurofilament M (B, E, H, h1, h2, K, green).