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Clinical and immunologic features of a recently recognized X-linked combined immunodeficiency disease ( XCID ) suggested that XCID and X-linked severe combined immunodeficiency ( XSCID ) might arise from different genetic defects .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
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