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Welcome to the website of the Netherlands Twin Register

The Netherlands Twin Register (NTR) was established in 1987 at the Vrije Universiteit in Amsterdam for scientific research purposes. The study of twins and their family members can provide insight into what extent the causes of differences between individuals are determined by genetic and environmental influences. With the continuous help of the participating twins and their families, the NTR examines the influence of genes and environment on the development of the brain, intelligence, problem behavior in children, health and life styles, anxiety and depression, personality and aging.