In this issue (8 articles)

1. 

   Original Research

   Growing Old but Not Growing Apart: Twin Similarity in the Latter Half of the Lifespan

   Matt McGue, Kaare Christensen Pages 1-12

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2. 

   Original Research

   ADRB2, brain white matter integrity and cognitive ageing in the Lothian Birth Cohort 1936

   Donald M. Lyall, Lorna M. Lopez, Mark E. Bastin, Susana Muñoz Maniega… Pages 13-23

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3. 

   Original Research

   Genetic Variation at the TPH2 Gene Influences Impulsivity in Addition to Eating Disorders

   Margarita C. T. Slof-Op’t Landt, Meike Bartels, Christel M. Middeldorp… Pages 24-33

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4. 

   Original Research

   What are We Measuring When We Test Strain Differences in Anxiety in Mice?

   Timothy P. O’Leary, Rhian K. Gunn, Richard E. Brown Pages 34-50

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5. 

   Original Research

   Prenatal Rapamycin Results in Early and Late Behavioral Abnormalities in Wildtype C57Bl/6 Mice

   Peter T. Tsai, Emily Greene-Colozzi, June Goto, Stefanie Anderl… Pages 51-59

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6. 

   Original Research

   Behavioral Characterization of a White-Throated Sparrow Homozygous for the ZAL2^m Chromosomal Rearrangement

   Brent M. Horton, Yuchen Hu, Christa L. Martin, Brian P. Bunke… Pages 60-70

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7. 

   Original Research

   Operating Characteristics of Alternative Statistical Methods for Detecting Gene-by-Measured Environment Interaction in the Presence of Gene–Environment Correlation in Twin and Sibling Studies

   Carol A. Van Hulle, Benjamin B. Lahey, Paul J. Rathouz Pages 71-84

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8. 

   Original Research

   A Generalized Defries–Fulker Regression Framework for the Analysis of Twin Data

   Laura C. Lazzeroni, Amrita Ray Pages 85-96

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