4761
Quantitative reverse - transcriptase PCR data indicate that , prior to the onset of puberty , expression of both Lin28b and Lin28a decreases in the ovary , while expression of only Lin28a decreases in the hypothalamus ; the expression of Lin28a increases after the onset of puberty in the pituitary .
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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