Figure 9.  .

Double-labeling for NG-2 and CD31 in BIs of vitreous at 7 WG (A–D) and blood vessels at 10 WG (E–H) and 12 WG (I–L). At 7 WG some BI cells were CD31⁺/NG-2⁺ (arrow in A–D) and others were CD31⁻/NG-2⁺ (arrowhead in A–D). At 10 and 12 WG, CD31⁺ endothelial cells (arrow in E–H) and CD31⁻ pericytes (arrowhead in E–H) of blood vessels were immunoreactive for NG-2. Scale bar in A = 10 μm for all.