10088
Velocity sedimentation , cross - linking , and immunoprecipitation analyses of detergent - solubilized rat brain revealed that the 32 and 34 kDa polypeptides reside within heterotetramers .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
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