3481
Here we used field inversion gel electrophoresis ( FIGE ) to construct a restriction map of approximately 1 , 000 kb of DNA surrounding the RB1 locus and to detect the translocation breakpoints in three retinoblastoma patients .
 retinoblastoma
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 retinoblastoma