Previous Article Next Article Table of Contents Science, Vol.370, No.6519, 921-921, 2020 Export Citation RETRACTION: Secondary siRNAs result from unprimed RNA synthesis and form a distinct class (Retraction of Vol 315, Pg 244, 2007) Sijen T, Steiner FA, Thijssen KL, Plasterk RHA Please enable JavaScript to view the comments powered by Disqus.