TNNI3 and acute myocardial infarction: Recently, Akter et al. successfully prepared an immunosensor based on 3,3′,5,5′-tetramethylbenzidine-carboxylic acid dendrimer, a label-free immunosensor used to detect cardiac troponin I (TnI) [200], which is the main biomarker used for diagnosis of acute myocardial infarction [201].