Rare Diseases Research (RDR) Challenges Call CHALLENGE #1: Development of a non-invasive tool for measuring rare disease patient mobility in daily living– Digital tools 4 Rare Diseases (DT4RD)CHALLENGE #2: Delivery system for intranasal administration of biological drugs to neonates– Intranasal Device for Neonates (INDENEO)Challenge #4: Pre-clinical assay to detect instability of microsatellite repeat– Development and validation of a novel pre-clinical assay to detect triplet repeat expansions (TRXassay)