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We evaluated the likelihood of tissues to be positive for carcinoembryonic antigen and the intensity of carcinoembryonic antigen staining in specimens of villous adenomas , mixed polypoid villous adenomas , polypoid adenomas , and diverticulitis using the peroxidase - antiperoxidase technique .
 GENE: carcinoembryonic antigen; GENE: carcinoembryonic antigen; GENE: peroxidase; GENE: antiperoxidase
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: carcinoembryonic antigen; GENE: carcinoembryonic antigen; GENE: peroxidase; GENE: antiperoxidase