Figure 2.

Red fluorescent granules in cardiac muscle. Frozen specimens of cardiac tissue were examined (150×) for the presence of accumulated porphyrin as described in Figure 1 ▶ . A: Autopsy specimen from a 29-year-old female (left ventricle infarction associated with disseminated intravascular coagulation). B: Rat cardiac muscle taken 24 hours after induction of acute cardiac ischemia by isoproterenol.