The tendency to conceive spontaneous dizygotic (DZ) twins is a complex trait with important
contributions from both environmental factors and genetic disposition. Twins are relatively …

Children differ in their ability to learn what is taught at school. Evidence from twin studies
suggests that genetic effects contribute to such differences. The aim of the present study was …

Anxiety disorders (ADs), namely generalized AD, panic disorder and phobias, are common,
etiologically complex conditions with a partially genetic basis. Despite differing on diagnostic …

Most disease-associated genetic variants are noncoding, making it challenging to design
experiments to understand their functional consequences,. Identification of expression …

The Netherlands Twin Register (NTR) is a national register in which twins, multiples and
their parents, siblings, spouses and other family members participate. Here we describe the …

OBJECTIVES: To examine whether regular exercise is associated with anxiety, depression
and personality in a large population-based sample as a function of gender and age …

Background: Polycystic ovary syndrome (PCOS) is one of the most common endocrine
disorders among women of reproductive age. There is evidence for a genetic component in …

Background—C-reactive protein (CRP) is a heritable marker of chronic inflammation that is
strongly associated with cardiovascular disease. We sought to identify genetic variants that …

Amajor component of variation in body height is due to genetic differences, but
environmental factors have a substantial contributory effect. In this study we aimed to …

The relative proportions of genetic and environmental variance in behavioral measures
have been studied extensively. A growing body of literature has examined changes in …