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Figure 4 Mean values (±SEM) for the ratio of ¹⁸F:¹³N in septum or average of left ventricular myocardium of normal volunteers (n = 15) and in hypertrophied (n = 8) and nonhypertrophied regions (n = 5) of patients with hypertrophic cardiomyopathy, after injection of ¹³N-ammonia and then 6-[¹⁸F]-fluorodopamine.