The invention relates to a method for analysing ribonucleic acid (RNA) interactions comprising: a) cross-linking base-paired nucleotides of at least one RNA molecule and/or at least one pair of RNA molecules using a tagged, reversible cross-linking agent (preferably tagged-psoralen) under ultraviolet irradiation; b) fragmenting the said cross-linked RNA molecule(s); c) using said tag to extract said cross-linked RNA fragment(s); d) ligating the said cross-linked RNA fragment(s) to produce cross-linked ligated RNA chimera(s); e) reversing the cross-linking of the said agent to the said RNA molecule(s); f) preparing a sequence library by sequencing the ligated RNA chimera molecule(s) or pair(s); and g) analysing the sequence library to determine RNA interactions. Also disclosed is a method of studying a subject by analysing RNA interactions and attributing them to a clinical picture, or a drug discovery method by attributing an efficacy score to the drug based upon determined RNA interactions.