This is an author produced version of a paper accepted by American Journal of Psychiatry. This paper has been peer- reviewed but does not include the final publisher proof- corrections or journal pagination. Longitudinal Stability of Genetic and Environmental Influences on Irritability: From Childhood to Young Adulthood. Roberson-Nay R, Leibenluft E, Brotman MA, Myers J, Larsson H, Lichtenstein P, Kendler KS. Am J Psychiatry. 2015 Jul;172(7):657-64. The official published article is available online at: DOI: 10.1176/appi.ajp.2015.14040509 Access to the published version may require subscription. Published with permission from: American Journal of Psychiatry