1. Cannabis and Other Illicit Drugs: Comorbid Use and Abuse/Dependence in Males and Females

   • Arpana Agrawal
   • Michael C. Neale
   • Kenneth S. Kendler

   OriginalPaper Pages: 217 - 228

2. The Genetic Basis of Problem Behavior in 5-Year-Old Dutch Twin Pairs

   • C. E. M. van Beijsterveldt
   • F. C. Verhulst
   • D. I. Boomsma

   OriginalPaper Pages: 229 - 242

3. A Candidate Gene Study of CYP19 (Aromatase) and Male Sexual Orientation

   • Michael G. DuPree
   • Brian S. Mustanski
   • Dean H. Hamer

   OriginalPaper Pages: 243 - 250

4. The Validity of the Neale and Kendler Model-Fitting Approach in Examining the Etiology of Comorbidity

   • Soo Hyun Rhee
   • John K. Hewitt
   • Michael C. Neale

   OriginalPaper Pages: 251 - 265

5. QTL Analysis of Multiple Behavioral Measures of Anxiety in Mice

   • Norman D. Henderson
   • Maria Grazia Turri
   • Jonathan Flint

   OriginalPaper Pages: 267 - 293

6. Anxious Behavior and Fenfluramine-Induced Prolactin Secretion in Young Rhesus Macaques with Different Alleles of the Serotonin Reuptake Transporter Polymorphism (5HTTLPR)

   • Cynthia L. Bethea
   • John M. Streicher
   • Judy L. Cameron

   OriginalPaper Pages: 295 - 307

7. Two Wistar Rat Lines Selectively Bred for Anxiety-Related Behavior Show Opposite Reactions in Elevated Plus Maze and Fear-Sensitized Acoustic Startle Tests

   • D. M. Yilmazer-Hanke
   • A. Wigger
   • H. Schwegler

   OriginalPaper Pages: 309 - 318

8. Spatial Memory of Heterozygous Staggerer (Rora⁺/Rora^sg) Versus Normal (Rora⁺/Rora⁺) Mice During Aging

   • J. Caston
   • C. Chianale
   • J. Mariani

   OriginalPaper Pages: 319 - 324

9. Identification of QTLs Involved in Open-Field Behavior in Young and Adult Laying Hens

   • A. J. Buitenhuis
   • T. B. Rodenburg
   • J. J. van der Poel

   OriginalPaper Pages: 325 - 333

10. Rare Male Mating Advantage for Inversion Karyotype in Drosophila ananassae

    • Arundhati Som
    • B. N. Singh

    OriginalPaper Pages: 335 - 342

11. Strain-Specificity in Nicotine Attenuation of Phencyclidine-Induced Disruption of Prepulse Inhibition in Mice: Relevance to Smoking in Schizophrenia Patients

    • Cecile Spielewoy
    • Athina Markou

    OriginalPaper Pages: 343 - 354

12. Behavioral Differences Among Rainbow Trout Clonal Lines

    • Megan D. Lucas
    • Robert E. Drew
    • Gary H. Thorgaard

    OriginalPaper Pages: 355 - 365