Fig. 8. Effect of MTN on vascularization in chick embryos. (A) Control chick CAM after incubation with an untreated agar disc for 48 hours. (B) CAM incubated for the same period with 0.25 ng MTN/disc and (C) with 1 ng MTN/disc. A distinct disorganization of the vessel formation, avascular zone, is seen at the locations where the discs were placed (d; arrowheads). Magnifications: x10.