A dermatologic suture clip.
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The interaction of RNA-binding proteins (RBPs) with RNA is a crucial aspect of normal cellular metabolism. Yet, the diverse number of RBPs and RNA motifs to which they bind, the wide range of interaction strengths and the fact that RBPs associate in dynamic complexes have made it challenging to determine whether a particular RNA-binding protein binds a particular RNA. Recent work by three different laboratories has led to the development of new tools to query such interactions in the more physiological environs of cultured cells. The use of these methods has led to insights into (1) the networks of RNAs regulated by a particular protein, (2) the identification of new protein partners within messenger ribonucleoprotein particles and (3) the flux of RNA-binding proteins on an mRNA throughout its lifecycle. Here, I examine these new methods and discuss their relative strengths and current limitations.