In vivo engraftment capacity of CD14⁺/VEGFR-2⁺ and CD14⁺/VEGFR-2^- cells. Immunohistochemical staining of sections from balloon-injured mouse femoral artery with an anti-GFP antibody showed (A) no localization of GFP⁺ areas in sham-transplanted and (B) CD14⁺/VEGFR-2^--transplanted cells on the luminal surface of the seeded artery. (C) Staining with control secondary antibody. (D) Significant number of GFP⁺ (red) CD14⁺/VEGFR-2⁺ cells (arrows) at 2 weeks and (E-F) 4 weeks were found in the animals that received these cells. Original magnification, 60 ×.