IL15 and atrial fibrillation: The highest AF mutants arose within individual Wyeth/IL-15/5Flu–vaccinated mice at HA22 (2.7%, arising in 1 of 12 mice), HA34 (7.5%, arising in 1 of 12 mice), and HA289 (3.6%, arising in 2 of 12 mice) in the HA1 fusion domains.