This Week in PNAS

Researchers from Yale University and elsewhere report in the Proceedings of the National Academy of Sciences this week that Hydra contain two PIWI proteins that are expressed in Hydra stem/progenitor cells, though not in differentiated cells. By sequencing piRNAs that bind to either Hywi or Hyli and mapping them to the Hydra transcriptome, they further found that piRNAs, especially ones expressed in interstitial lineage, are enriched for transposon transcripts.

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