1838
These lymphatic capillaries play a critical role in particle clearance , and the accumulation of NB2 , but not NS , suggests possible impaired lymphatic clearance by the high aspect ratio particles .
 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