XENTION LTD ("Xention"), the Cambridge-based biopharmaceutical company specialising in the discovery and development of ion channel-modulating drugs for atrial fibrillation, and SERVIER, the leading independent French pharmaceutical company ("Servier") announced today that they had entered into a multi-year agreement for the development and commercialisation of XEN-D0103, a selective Kv1.5 modulator discovered and developed by Xention for the treatment of atrial fibrillation ("AF").