27543
In addition , Nppc and Npr2 expressions were reduced by Smad4 depletion ; thus , their effect of maintaining oocyte meiotic arrest was weakened in Smad4 conditional knockout mice .
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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