2333
Amino acid sequences of more than five hundreds TFTs are determined ; these toxins form one of the largest protein families present in snake venoms .
 Chemical: Amino acid
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: Amino acid 
Answer:
 Chemical: Amino acid