A crosstalk between intracellular CXCR7 and CXCR4 involved in rapid CXCL12-triggered integrin activation but not integrin activation but not in chemokine-triggered motility of human T lymphocytes and CD34+ cells.

Hartmann TN, Grabovsky V, Pasvolsky R, Shulman Z, Buss EC, Spiegel A, Nagler A, Lapidot T, Thelen M, Alon R.

http://www.ncbi.nlm.nih.gov/pubmed/18653785