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In the work described herein , we have selected two distinct naturally occurring null mutations of GALT , Q188R and R333W , and asked the questions ( i ) what are the impacts of these mutations on subunit assembly , and ( ii ) if heterodimers do form , are they active ?
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 None