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Four weeks after the last calf stopped shedding , all calves were necropsied and samples from the gastrointestinal tract were taken for the detection of the nalidixic - acid resistant E . coli O157 .
 Anatomy: samples; Anatomy: gastrointestinal tract
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: gastrointestinal tract