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We have used single strand conformation polymorphism analysis to study the 27 exons of the RB1 gene in individuals from a family showing mild expression of the retinoblastoma phenotype .
 Disease: retinoblastoma
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: retinoblastoma