2194
The mechanisms for abnormal Reelin expression in some of these disorders are currently unknown although possible explanations include early developmental insults , mutations , hypermethylation of the promoter for the Reelin gene ( RELN ) , miRNA silencing of Reelin mRNA , FMRP underexpression and Reelin processing abnormalities .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None