Acts as a regulator of the electron transfer flavoprotein by promoting the removal of flavin from the ETF holoenzyme (composed of ETFA and ETFB). homotetramer (Probable). Interacts with NDUFAB1 (PubMed:27499296). Interacts with ETFA (PubMed:27499296). Interacts with ETFB (PubMed:27499296). Belongs to the complex I LYR family. Truncated N-terminus. Truncated N-terminus.