Ranges in peripheral white blood cells (granulocytes and lymphocytes) after the sequential use of G-CSF and anti-VLA4 (animal B in Fig 2). Note that during the anti-VLA4 treatment despite the expected significant drop in granulocytes (after cessation of G-CSF ) there is a small peak in lymphocytes (the characteristic response in anti-VLA4 treatment) and an even smaller peak of nucleated red blood cells. The latter is virtually unmeasurable in treatments with anti-VLA4 alone.