8650
It has a well - defined cellular target ( i . e . , NaV channels ) and pharmacological mode of action ( i . e . , block of nerve and muscle action potentials ) , and it is an indispensable chemical tool in neuroscience .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None