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To dissect the environmental differences in selection on life history QTL across climatic regions , we grew a panel of interconnected recombinant inbred lines ( RILs ) of Arabidopsis thaliana in four field sites across its native European range .
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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:
 None