Fig. 8 EC plasticity in the absence of a vascular wall. (A,B) QH1 immunoreactivity (A), and phase contrast image (B) of EC isolated from E11 aortae. The majority of the cells are QH1 positive. (C,D) QH1 staining of a chick host that had received a graft of isolated EC, not visible in these sections. (C) Quail EC are found in the aorta (Ao) and the cardinal (cv) and subcardinal veins (scv, arrowheads). (D) Adjacent section, QH1-positive cells are found in the brachial artery (ba, arrows) and in the cardinal and umbilical veins (uv, arrowheads). Bars, (A,B) 85 µm, (C,D) 40 µm.