Assertion: circulatory system's vessel | /r/HasProperty | angiogenesis
Facets:
Source sentences:
text: Growth factors such as vascular endothelial growth factor (VEGF) stimulate formation of the vascular system from embryonic mesenchyme (vasculogenesis), help maintain the vasculature in adults, and promote capillary sprouting and outgrowth from small existing vessels (angiogenesis) during normal growth, during tissue repair and regeneration, and in tumors and other pathological conditions.