G-CSF increases 67LR expression in mouse BM and PB CD34⁺ cells. 67LR expression on PB CD34⁺ cells and on BM CD34⁺ cells before (left panels) and after G-CSF administration (right panels) from one representative mouse. BALB/c mice were treated daily for 5 days with 300 μg/kg G-CSF or with saline, as a control. Four hours after the last injection, PB and BM CD34⁺ cells were analyzed by flow cytometry, with a mouse-specific anti-CD34–PE antibody and with an anti-67LR polyclonal antibody, detected by a FITC-conjugated antirabbit antibody.