5624
Conversion of these sites to alanine residues greatly reduced transforming activity , and although the mutant 55 - kDa protein was found to interact with p53 at normal levels , it was somewhat defective for suppression of p53 transactivation activity .
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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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