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The Animal QTL database ( QTLdb ; http : / / www . animalgenome . org / QTLdb ) is designed to house all publicly available QTL and single - nucleotide polymorphism / gene association data on livestock animal species .
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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:
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