4216
Of the four different mutations identified , one was identical to a previously reported mutation ( C - - > T transition at codon 240 ) , and three were novel two in the glycine - rich region and one in the proline / serine / threonine - rich ( PST ) region .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 None