1547
Immunoblotting and immunostaining studies demonstrated an upregulation of vascular endothelial growth factor ( VEGF ) mostly along the endothelium lining peritoneal blood vessels in long - term PD patients .
 endothelium, peritoneal blood vessels
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 endothelium, peritoneal blood vessels