20267
Mammalian transposon - silencing piRNAs accumulate early in spermatogenesis , whereas pachytene piRNAs are produced later during postnatal spermatogenesis and account for > 95 % of all piRNAs in the adult mouse testis .
 None
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