Following behavioral testing, mice were returned to their home cages. After 2 h, mice were deeply anesthetized with isoflurane and transcardially perfused with 20 ml of heparinized saline solution and then with 30 ml of 4% paraformaldehyde in 0.1 M phosphate buffer (PB) at pH 7.4 and 4 °C. Brains were harvested and stored in the same fixative for 90 min at 4 °C followed by at least 24 h of immersion in 20% sucrose solution in 0.1 M PB with 4% paraformaldehyde. Coronal Sects. (30 µm thickness) were obtained using a cryostat microtome. Sections containing the BLA were mounted onto glass slides and counterstained with Cresyl Violet to precisely locate the microinjection site under light microscopy. The remaining sections were used for immunohistochemistry.