8446
In vitro transfection mediated by dendrigraft poly ( L - lysines ) : the effect of structure and molecule size .
 Chemical: poly ( L - lysines )
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: poly ( L - lysines ) 
Answer:
 Chemical: poly ( L - lysines )