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Patients with generalized atrophic benign epidermolysis bullosa often show decreased expression of type XVII collagen , a transmembrane hemidesmosomal protein encoded by COL17A1 .
 Disease: atrophic benign epidermolysis bullosa
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 Disease: atrophic benign epidermolysis bullosa