10020
Selectivity for the endothelial cells was achieved by introduction of antibodies specific for inflammatory endothelial adhesion molecules E - selectin or VCAM - 1 chemically linked to the virus via polyethylene glycol .
 Chemical: polyethylene glycol
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: polyethylene glycol 
Answer:
 Chemical: polyethylene glycol