Abstract
Small non-coding RNAs act through diverse RNA interference (RNAi) pathways to transcriptionally or post-transcriptionally silence their targets. piRNAs (Piwi Interacting RNAs) are a distinct class of 30-nucleotide-long RNAs that are only present in the germ line. In zebrafish they bind to the Argonaute related Piwi proteins Ziwi and Zili, which
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