Fig. 4.

QH1-stained sections showing two venular assemblies between CAM and graft-mesonephros (MES) vasculatures. (A) Chick mesonephros grafted onto quail CAM (QH1 positive). The arrows indicate a constriction at the level of the endothelial junction between host (Hv) and graft (Gv) veins. There is no invasion of host vessels into the graft. Peripheral regions presented a great invasion of QH1 quail-positive cells (arrowheads). t, tubule. Scale bar = 55 µm. (B) Quail mesonephros (QH1 positive) grafted onto chick CAM. The arrows indicate the endothelial junction between host (Hv) and graft (Gv) veins. Note the adequate vascularization of the grafted mesonephros. Scale bar = 250 µm.