FAP (CD73+CD90−CD56−), CD90 (CD73+CD90+CD56−), and CD56 (CD73+CD56+CD90+) cell subsets, as well as LRPC (CD73+CD90+CD56−), were induced in either single fibrogenic (F), adipogenic (A), and myogenic (M) culture conditions, or mixed culture conditions at various combinations, including adipo-fibrogenic (AF), adipo-myogenic (AM), fibro-myogenic (FM) and adipo-fibro-myogenic (AFM) conditions. This evidence concerns the gene FAP and atrial fibrillation.