6897
Surprisingly , in contrast to balanced translocations , we identify nonallelic homologous recombination ( NAHR ) between ( retro ) transposable elements and especially long interspersed elements ( LINEs ) as the main mutational mechanism .
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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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