12023
Tetrodotoxin ( 10 ( - 6 ) M ) , capsaicin ( 10 ( - 5 ) M ) and removal of endothelium did not alter these contractions suggesting that they were not neural in origin and endothelium - derived contracting factors were unlikely to be involved .
 Chemical: Tetrodotoxin; Chemical: capsaicin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Tetrodotoxin; Chemical: capsaicin