Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Green area above the timeline refers to studies on animals, while blue area below the timeline refers to clinical trials on human. SMCs: smooth muscle cells; ECs: endothelial cells; BMCs: bone marrow cells.
