All animal use was approved by the institutional animal care and use committee of the Gallo Center in accord with the guidelines for animal use laid out by the US Public Health Service. Unless stated otherwise, all animals were group-housed in a climate controlled facility on a 12 hr light/dark cycle (lights on at 07:00), and food (Picolab Rodent Diet 20 #5053, Lab Diet) and water were available ad libitum. All experimentation was carried out at the same time of the day by the same investigator. Only male animals were used for behavioral experiments.
