2518
Restriction mapping and sequencing of clones that span both translocation breakpoints as well as the corresponding normal regions indicate the loss of approximately 5 kb in the formation of the derivative X chromosome , with 4 - 6 bp deleted from chromosome 4 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
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