Double-color flow cytometric analysis of the distribution and modulation of CXC chemokine receptor (CXCR) 3 or CXCR4 on CD34⁺ hematopoietic progenitors.

The CD34⁺ cells were either freshly isolated (A, B, D, and E) or stimulated with granulocyte-macrophage colony-stimulating factor (GM-CSF) for 36 hours (C and F). Panels A and D show results with isotype controls. The data are from a single experiment representative of 4 similar experiments performed.