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This study, which is part of a Moscow longitudinal twin project, aims to explore genetic and environmental contributions to inter-individual variability of temperamental traits in adolescence on the basis of a Russian sample. 85 monozygotic (MZ) and 64 same-sex dizygotic (DZ) twin pairs aged 12 to 14 completed the children's version of the Rusalov Structure of Temperament Questionnaire (C-STQ). The...