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We report here fine physical mapping of the obligate region containing the Norrie disease gene ( NDP ) defined by a recombination and by the smallest submicroscopic chromosomal deletion associated with Norrie disease identified to date .
 Norrie disease, Norrie disease
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 Norrie disease, Norrie disease