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Phenylephrine reactivity of cerebral arteries isolated from sham-operated (Sham; n=8), ovariectomized (OVX; n=8) rats, and tamoxifen-treated OVX (OVX+TAM; n=8) rats. Results are mean±s.e. *: P<0.05 versus all other groups (ANOVA, Scheffé's F test).
