1707
The soluble factors they release in its presence arrest the cycle of endothelial cells ( EC ) , inhibit in vitro angiogenesis , negatively modulate the production of matrix metalloproteinase - 9 , and the ability of EC to adhere to vitronectin and up - regulate ICAM - 1 and VCAM - 1 expression .
 endothelial cells, EC, EC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 endothelial cells, EC, EC