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Since ras genes have been found to be frequently activated in human tumours , we examined the levels of ras p21 in the sera of a variety of human cancer patients .
 Anatomy: tumours; Anatomy: sera; Anatomy: cancer
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
 Entities: tumours, sera, cancer 
Answer:
 Anatomy: tumours; Anatomy: sera; Anatomy: cancer