307
By using exon - specific polymerase chain reaction ( PCR ) / single - strand conformation polymorphism as a screening step and nucleotide sequencing of target exons , we determined that the proband was a compound heterozygote for two C6 gene mutations .
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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