Reducing equivalents from beta-oxidation of fatty acids transfer to ETF Electron transfer flavoprotein, ETF, a 63kDa heterodimer composed of alpha and beta subunit, binds one FAD and one AMP per dimer. ETF resides on the matrix face of the mitochondrial inner membrane. Reducing equivalents from the beta-oxidation of fatty acyl CoAs are transferred to ETF, reducing the ETF-bound FAD to FADH₂. Reactome Database ID Release 43169260 Reactome, http://www.reactome.org ReactomeREACT_6154 ETF (reduced) ETF