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The relationship of the genes coding for HLA to those coding for properdin Factor B allotypes and for deficiency of the second component of complement ( C2 ) was studied in families of patients with connective tissue disorders .
 Disease: deficiency of the second component of complement
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: deficiency of the second component of complement