1. microRNA BIOGENESIS AND FUNCTION - AN OVERVIEW Ren? F. Ketting Abstract Introduction: PTGS in Plants and Small RNAs RNAi Dicer Argonaute The First microRNAs and Links to RNAi miRNAs: Ancient Mediators of Gene Regulation Primary miRNA Processing by Drosha Small RNA Selectivity of Argonaute Proteins Target Recognition Mechanisms of miRNA?Mediated Silencing Regulating miRNAs Conclusion 2. REGULATION OF pri?miRNA PROCESING THROUGH Smads Akiko Hata...