Whether d7EB transplantation alone influenced the CD11bϩ cells by affecting the composition of the CD11bϩ cell population isolated from lungs of septic mice undergoing d7EB transplantation was addressed. No significant difference was observed in the number of monocytes (F4/80-positive), polymorphonuclear leukocytes (Gr-1-positive), and natural killer cells (NK1.1-positive) in the CD11bϩ populations of the d7EB recipient and control lungs ( Figure 4B) .