Neuren Pharmaceuticals (NEU: $14.20) announced this week a significant expansion of its partnership with US biopharmaceutical company Acadia Pharmaceuticals (NASDAQ: ACAD). The agreement not only sees Acadia's exclusive licence for trofinetide in North America expand to a worldwide licence, but also Acadia's acquisition of the exclusive worldwide licence for NNZ-2591 in Rett Syndrome and Fragile X Syndrome.