DeFries–Fulker and Pearson–Aitken Model-fitting Analyses of Reading Performance Data from Selected and Unselected Twin Pairs Jesse L. HawkeMichael C. StallingsJohn C. DeFries Original Research 23 January 2008 Pages: 101 - 107
Environmental Factors in Obsessive-Compulsive Behavior: Evidence from Discordant and Concordant Monozygotic Twins Danielle C. CathDaniel S. van GrootheestDorret I. Boomsma Original Research Open access 11 January 2008 Pages: 108 - 120
Speed, Variability, and Timing of Motor Output in ADHD: Which Measures are Useful for Endophenotypic Research? Nanda N. J. RommelseMarieke E. AltinkJoseph A. Sergeant Original Research Open access 11 December 2007 Pages: 121 - 132
TPH2 and TPH1: Association of Variants and Interactions with Heroin Addiction David A. NielsenSandra BarralMary Jeanne Kreek Original Research 08 January 2008 Pages: 133 - 150
Genetic Heterozygosity and Sociality in a Primate Species Marie J. E. CharpentierFranck PrugnolleAnja Widdig Original Research 22 February 2008 Pages: 151 - 158
Chromosomal Assignment of Quantitative Trait Loci Influencing Modified Hole Board Behavior in Laboratory Mice using Consomic Strains, with Special Reference to Anxiety-related Behavior and Mouse Chromosome 19 Marijke C. LaarakkerFrauke OhlHein A. van Lith Original Research 04 January 2008 Pages: 159 - 184
Measurement of Segregating Behaviors in Experimental Silver Fox Pedigrees Anna V. KukekovaL. N. TrutG. M. Acland Original Research 21 November 2007 Pages: 185 - 194
Sex Combs are Important for Male Mating Success in Drosophila melanogaster Chen Siang NgArtyom Kopp Original Research 23 January 2008 Pages: 195 - 201
Power Calculations Using Exact Data Simulation: A Useful Tool for Genetic Study Designs Sophie van der SluisConor V. DolanDanielle Posthuma Original Research Open access 13 December 2007 Pages: 202 - 211
Twin Analysis on Paired Comparison Data Koken Ozaki Original research 27 November 2007 Pages: 212 - 222