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Mean systolic blood pressure (left panel) and mean diastolic blood pressure (right panel) during the cold pressor test among probands, siblings, offspring, spouses, and parents. Pre, 0, 1, 2 and 4 on the x-axis indicate cold pressor test time points: prior to ice water immersion, immediately after end of ice water immersion, and 1, 2 and 4 minutes after end of ice water immersion.
