8651
It is widely distributed in marine and terrestrial ecosystems where it plays a role in the chemical ecology of predator - prey relationships and drives evolutionary selection of TTX - resistance ( Hanifin , 2010 ; Williams , 2010 ; Zimmer and Ferrer , 2007 ) .
 Chemical: TTX
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: TTX