He said further research was needed to determine whether there was a definite cause and effect relationship between a decrease in endothelial progenitor cells and cardiovascular disease.
They were then able to give the mice higher doses of radiation therapy with no ill effect by blocking a mechanism by which endothelial cells communicate with each other.
Previous research has indicated that a substance called nitric oxide, which is released from the endothelial cells, keeps the artery in good condition by stimulating the production of muscle in its wall.