Additional file 1: Figure S1. To double-label BLA with c-fos and parvalbumin, BLA sections were stained with parvalbumin and developed with DAB. c-Fos was labeled and developed with DAB-nickel ammonium sulfate. Representative images of c-Fos and parvalbumin double labeling, blue arrows indicate the double labelling cells; black arrows indicate the single labelling cells.