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Cardiac troponin I (cTNI) concentrations in group 3 (control), group 2 (cardiac), group 1 (hyperthyroid), and a group of cats from group 1 sampled 3 months after treatment of hyperthyroidism with 131I. The asterisk represents a cat in group 1 with a cTNI of 1.53 ng/mL. The dotted line represents 0.16 ng/mL, the upper reference limit.
