The establishment of the TRIXY Center of Expertise: the only nationally recognised centre of expertise to combine psychological care and scientific research for children, adolescents and adults born with an extra X or Y chromosome. This can lead to various syndromes, each with specific characteristics. The team of scientists and clinicians at TRIXY ensures that important knowledge is gathered about the vulnerabilities associated with these syndromes, particularly in the areas of cognitive, emotional and social development, and is translated into clinical practice.