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Combined subtotal deficiency of C6 and C7 , in which both proteins are expressed at very low levels , has been observed in homozygous form in two families .
 Disease: Combined subtotal deficiency of C6 and C7
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: Combined subtotal deficiency of C6 and C7