TNNI3 and myocardial infarction: To evaluate the diagnostic ability of Alu-based real-time PCR for discriminating MI patients from normal controls, the ROC curves of cTnI, CK, CK-MB, LDH, Alu1, Alu2, Alu3, Alu4, Alu5 and Alu were drawn (Fig. 7).