1028
Mutations identified in this study include 19 missense mutations , two nonsense mutations , one intragenic deletion , four microdeletions , one insertion , and one intronic sequence substitution that is likely to result in a splice site defect .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 None