Predator odor stress induced a rapid decrease in GluA1-IR in cerebellar lobule 5. A, B, GluA1-IR in lobule 5 decreased 3 h after exposure to fox urine. C, Quantification of GluA1-IR in the molecular layer of each lobule (lobules 1–10) showing a lack of effect of stress on GluA1 expression in lobules 1–3 and 7–10 (naive, N = 4; stress, N = 4). D, A reduction in GluA1-IR in lobule 5 was detected as early as 3 h, and lasted for at least 24 h, after stress. *p < 0.04 (unpaired t test).