PAR-CLIP (Photoactivatable Ribonucleoside-Enhanced Crosslinking and Immunoprecipitation): a step-by-step protocol to the transcriptome-wide identification of binding sites of RNA-binding proteins. - Spitzer J; Hafner M; Landthaler M; Ascano M; Farazi T; Wardle G; Nusbaum J; Khorshid M; Burger L; Zavolan M; Tuschl T (Methods in enzymology, 2014)