Intern. J. Neuroscience, 117:47–62, 2007 Copyright C  2007 Informa Healthcare ISSN: 0020-7454 / 1543-5245 online DOI: 10.1080/00207450500535719 CHLORPYRIFOS INCREASES THE LEVELS OF HIPPOCAMPAL NMDA RECEPTOR SUBUNITS NR2A AND NR2B IN JUVENILE AND ADULT RATS FATIH GULTEKIN INANC KARAKOYUN RECEP SUTCU EMIN SAVIK Suleyman Demirel University School of Medicine Department of Biochemistry Isparta, Turkey GOKHAN CESUR Suleyman Demirel University School of Medicine Department of Physiology Isparta, Turkey HIKMET ORHAN Suleyman Demirel University School of Agriculture, Department of Animal Science Unit of Biometry Isparta, Turkey Received 31 October 2005. This study was supported by Suleyman Demirel University Research Fund. Address correspondence to Fatih Gultekin, Suleyman Demirel Universitesi, Tip Fakultesi, Biyokimya Anabilim Dali, 32260 Isparta, Turkey. E-mail: fatih@sdu.edu.tr or drfatih2000@ hotmail.com 47