Florence Sabin and the mechanism of blood vessel lumenization during vasculogenesis.

The notion that blood vessel lumina and primordial blood plasma are linked by a single mechanism, intracellular vacuolation of angioblasts, has, for the most part, been overlooked since it was first described in the early decades of the last century. That vacuolation may play a major role in blood vessel formation during vasculogenesis is revisited from the perspective of Florence Sabin's seminal studies in the nascent mesoderm of living chick blastoderms.