1532
We have used nuclear magnetic resonance ( NMR ) to obtain the structure of an RNA " kissing " hairpin complex formed between the HIV - 2 TAR hairpin loop and a hairpin with a complementary loop sequence .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
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