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We plan to systematically investigate the effects of thawing and refreezing on RNA integrity , by deliberately thawing and freezing small samples of brain tissue over varying time intervals and temperatures .
 Anatomy: samples; Anatomy: brain tissue
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: samples; Anatomy: brain tissue