22016
The T5 capsid with its " simple " two - state conversion thus appears to be a very attractive model for investigating the mechanism of the large - scale allosteric transition that takes place upon the genome packaging of dsDNA bacteriophages .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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