Functional Tests to Resolve Unsolved Rare Diseases. Rares. March 4, 2023checkorphan Learn more about: Rubinstein-Taybi syndrome Related Clinical Trial Functional Tests to Resolve Unsolved Rare Diseases. Rares. Diagnosis of RSTS: Identification of the Acetylation Profiles as Epigenetic Markers for Assessing Causality of CREBBP Variants. Recruitment InformationAdministrative Informations