2304
Small nuclear ribonucleoprotein polypeptide N ( SNRPN ) , an expressed gene in the Prader - Willi syndrome critical region .
 Prader - Willi syndrome
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 Prader - Willi syndrome