NFKB1 and brain infarction: Brain infarct volume (TTC staining), N.S. (spontaneous activity, symmetry of movement, open‐field path linearity, vibrissae touch; postural reflex test), cell death (TUNEL assay), TNFα (ELISA), IFR3, NF‐κB, and TLR3 protein level (Western blot)