4309
After 15 days of E2 exposure , VEGF / VPF protein expression , in the non - endothelial cell population , sharply declined and was restricted to the blood vessels .
 Chemical: E2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: E2