8062
The unique electrical , structural and mechanical properties , diversity of available surface chemistry and cell - penetrating ability of CNTs have made them useful implantable matrices or carriers for the delivery of therapeutic molecules .
 None
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:  
Answer:
 None