14753
Furthermore , we show that retrotransposon mRNAs are derepressed in Tex19 . 1 ( - / - ) placentas and that protein encoded by the LINE - 1 retrotransposon is upregulated in hypomethylated trophectoderm - derived cells that normally express Tex19 . 1 .
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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