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MAP and heart rate (HR) responses to intravenous infusions of ANG II (50 ng·kg−1·min−1) in young (4 mo), middle-aged adult (12 mo), and old (29 mo) rats. The initial, or starting values, are averages of the last 30 min before bolus injections of vehicle or minoxidil at −1 h. Lines indicate start of ANG II infusions at 0 h. Values are means ± SE.
