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Furthermore , mutations in the PMP70 gene have also been identified in two Zellweger syndrome patients from CG1 , raising the possibility that CG1 patients may represent a mixture of PEX1 - deficient and PMP70 - deficient individuals .
 Zellweger syndrome
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 Zellweger syndrome