2319
Recently , we and others have isolated a candidate gene for X linked Norrie disease ( ND ) which was found to be deleted or disrupted in several patients .
 X linked Norrie disease, ND
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 X linked Norrie disease, ND