Choose the most appropriate answer for each question.
Question 1 :
This has been attributed to the hypertranscriptional state of the meiotic and post-meiotic spermatogenic cells, which facilitates _____________ of otherwise silenced genes, such as those derived from retroposition or other means of gene duplication.
Question 2 :
Much of our understanding derives from the study of mice with targeted mutations, finding key _____________ factors, growth factors and receptors required for normal palatogenesis.
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