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Fe2O3 nanoparticles obtained after calcination of the immobilized Fe3 + / G4 - NH2 composite served as catalytic " seeds " for the growth of single - wall carbon nanotubes ( SWNTs ) by microwave plasma - enhanced CVD ( PECVD ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
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