A small proportion of mesenchymal stem cells strongly expresses functionally active CXCR4 receptor capable of promoting migration to bone marrow.

By R. Wynn, C. Hart, Carla Corradi-Perini, Liam O'neill, C. Evans, J. Wraith, L. Fairbairn, I. Bellantuono. Blood, 2004

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Mesenchymal stem cell homing: the devil is in the details. (2009, positive): “…environment, it is critical to consider the heterogeneity in MSC surface receptor expression and resulting MSC behavior that has been observed both within and between studies (Jones et al., 2002; da Silva Meirelles et al., 2006; Simmons and Torok-Storb, 1991; Sordi et al., 2005; Wynn et al., 2004).”
Clinical Trials with Mesenchymal Stem Cells: An Update (2016, background): “have demonstrated that CXCR4 can appear in subpopulations of MSCs, which aids in CXCL12-dependent migration and homing (135).”
Mesenchymal Stem Cells Are Recruited into Wounded Skin and Contribute to Wound Repair by Transdifferentiation into Multiple Skin Cell Type1 (2008, result): “These data are consistent with previous report that showed a minority of MSCs (2–25%) were expressed as a restricted set of chemokine receptors (29, 30).”