13673
We sequenced the mitochondrial DNA , four autosomal introns and three haemoglobin genes ( alpha ( A ) , alpha ( D ) , beta ( A ) ) and used isolation - with - migration ( IM ) models to study gene flow between North America and South America , and between the tropical and southern Andes .
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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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