Despite myriad challenges, clinicians see room for progress.
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PLANT BIOLOGY Retraction for “RNA silencing of host transcripts by cauliflower mosaic virus requires coordinated action of the four Arabidopsis Dicer-like proteins,” by Guillaume Moissiard and Olivier Voinnet, which appeared in issue 51, December 19, 2006, of Proc Natl Acad Sci USA (103: …