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We have recently shown that the tissue - specific expression of the RAR beta 2 gene in mouse embryos is regulated at the translational level by short upstream open reading frames ( uORFs ) In the 5 ' - untranslated region ( Zimmer , A . , A . M .
 RAR beta 2 gene in mouse embryos
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 RAR beta 2 gene in mouse embryos