p-JNK (F; n = 5 animals/group) and IRS-1pSer312 (G; n = 6 animals/group) levels (normalized by total JNK and total IRS-1, respectively) in skeletal muscle of mice 7 days after i.c.v. injection of vehicle or AβOs. In (F), *P = 0.0464; in (G), *P = 0.0081; Student's t-test. 