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Somatic - cell selection is a major determinant of the blood - cell phenotype in heterozygotes for glucose - 6 - phosphate dehydrogenase mutations causing severe enzyme deficiency .
 Disease: enzyme deficiency
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: enzyme deficiency