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We devised a new method for detecting ancient recombinations through phylogenetic network analysis , and detected five ancient recombinations in gibbon ABO blood group genes [ Kitano et al . , 2009 . Mol . Phylogenet . Evol . , 51 , 465 - 471 ] .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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