The late components of PFP-SR and the PFP-AF sites display low voltages: a median voltage of 0.30 mV (Q1–Q3: 0.20–0.50 mv) in PFP-AF and 0.35 mV (Q1–Q3: 0.20–0.56 mv) in PFP-SR, and the median duration of PFP-SR measured 61 ms (Q1–Q3: 51–76 ms; Figure 1C). This evidence concerns the gene PRF1 and atrial fibrillation.