5364
We were unable to detect BRCA1 mutations in 4 of the 20 families , but only 1 of these was clearly linked to BRCA1 .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
 Entities:  
Answer:
 None