Blood vessels deliver nutrients and oxygen to each organ in our body. They are difficult to completely restore to their original conditions once damaged by myocardial infarction or severe ischemic diseases....

Immune cells called “killer T cells,” also known as cytotoxic or cytolytic CD8 T cells, normally stay in the bloodstream and do not enter organs and other tissues, according to a new study...

White blood cells are known to circulate through the entire body through blood vessels, acting as a surveillance system. However, a specialized group of these cells are permanently present in tissues...