As some of the first images captured by electron microscope showed, the endothelial cells lining blood vessels in the... (newscientist.com)
Endothelial cells lining blood vessels help keep what belongs in and what doesn't belong out. (asbmb.org)
However, the St. Jude researchers discovered the cancer arises from immature progenitors that would normally develop into cells lining blood vessels. (sciencedaily.com)