Positive staining for NHE1 protein was observed in 66.7% (6/9) of MI biopsies and in 71.4% (10/14) of MC biopsies, whereas only 20% (1/5) of the NB biopsies exhibited NHE1 positivity (Figure 1A). The gene discussed is SLC9A1; the disease is myocardial infarction.