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Deletion of small nuclear ribonucleoprotein polypeptide N ( SNRPN ) in Prader - Willi syndrome detected by fluorescence in situ hybridization : two sibs with the typical phenotype without a cytogenetic deletion in chromosome 15q .
 Disease: Prader - Willi syndrome
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 Disease: Prader - Willi syndrome