ABSTRACT
Angiogenesis can be defined as structural expansion of a microvascular bed
occurring as outgrowth from the existing vasculature. This is distinct from
vasculogenesis, which refers to the development of new vasculature, as most
obviously occurs in development. Angiogenesis is a widely studied and very
complex process. Almost daily, new twists are discovered as additional factors
that initiate or regulate the process are discovered.
