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Mutation in the gene encoding the recently isolated WASP protein has now been identified as the genetic defect responsible for the X - linked Wiskott - Aldrich syndrome ( WAS ) , a primary immunodeficiency disease associated with extensive phenotypic variability .
 genetic defect, X - linked Wiskott - Aldrich syndrome, WAS, immunodeficiency disease
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 genetic defect, X - linked Wiskott - Aldrich syndrome, WAS, immunodeficiency disease