Gr-1+CD11b+ myeloid cells increase angiogenesis in vitro and in vivo (A) Representive endothelial sprouts after 7 days of aortic ring sprouts assay. a, aorta ring culture with no cells; b, aorta ring culture with Gr-1+CD11b+ myeloid cells. Magnification ×10. (B) Gr-1+CD11b+ myeloid cells significantly increase endothelial sprouts compared with no cell treatment, *p < 0.01 versus EGM. (C) Gr-1+CD11b+ myeloid cells home to the site of window chamber after injection from tail vain. a, Gr-1+CD11b+ myeloid cells marked with PKH-26. Magnification ×100. b, Gr-1+CD11b+ myeloid cells homed to the site of window chamber. Magnification ×40. (D) Gr-1+CD11b+ myeloid cells increase angiogenesis in window chamber. a, saline treatment; b, Gr-1+CD11b+ myeloid cells treatment. Magnification ×10.