899
Therefore , disease - causing mutations at CpGs in RB1 appear to be determined by several factors , including the constitutive presence of DNA methylation at cytosines within CpGs , the specific codon within which the methylated cytosine is located , and the particular region of the gene within which that codon resides . .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 None