OR10B1P and atrial fibrillation: Furthermore, 11 enzymatic genes associated with BCFAs were investigated based on the pathway retrieved from KEGG database (Fig. S2a), with 5 genes significant decreased in the gut of AF individuals (q = 5.38E-08, Log 2 [Fold Change] = -0.4844 for 3-methyl-2-oxobutanoate dehydrogenase; q = 0.0002, Log 2 [Fold Change] = -0.2364 for acetolactate synthase; q = 0.0498, Log 2 [Fold Change] = -0.0940 for 2-oxoisocaproate dehydrogenase; q = 0.0230, Log 2 [Fold Change] = -0.1333 for 3-isopropylmalate dehydratase; q = 1.05E-05, Log 2 [Fold Change] = -0.3674 for dihydrolipoyl dehydrogenase).