21274
Passage of the CA through the gastrointestinal ( GI ) tract was followed by T1 - weighted magnetic resonance imaging ( MRI ) over a period of 47h , by which time the CA had exited the GI tract .
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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:
 None