However, neither NaV1.8 (SR: n = 14 patients, AF: n = 14 patients) nor NaV1.5 (SR: n = 14 patients, AF: n = 13 patients) protein expression levels were different between myocardium from patients with AF and SR (Fig. 1d–f). The gene discussed is SCN5A; the disease is atrial fibrillation.