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Renal sympathetic nerve discharge (Δ renal SND, %) responses to heating (Tc 41.5°C) and RVLM bicuculline (BIC) microinjections at 41.5°C (RVLM BIC, 41.5°C) (left two bars), and in response to RVLM BIC microinjections at 38°C (right bar) in young (top) and aged (bottom) rats.