Steady-state G-CSF mRNA levels in bone marrow and peritoneum after SCH 14988 treatment in neutropenic mice. Lane 1, 1-kb ladder; lane 2, bone marrow from normal, age-matched mice; lane 3, bone marrow from CY mice dosed with vehicle; lane 4, bone marrow from CY mice dosed with SCH 14988 at 40 mg/kg; lane 5, peritoneal cells from normal, age-matched animals; lane 6, peritoneal cells from CY mice dosed with vehicle; lane 7, peritoneal cells from CY mice treated with SCH 14988.