NADH dehydrogenase 1 alpha subcomplex subunit 3 is a protein in humans that is encoded by the NDUFA3 gene, which is gene codes for a subunit of Complex I of the respiratory chain that acts as an accessory subunit of the complex and is believed not to be involved in catalysis.
NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 3 is a protein that in humans is encoded by the NDUFA3 gene. The human NDUFA3 gene codes for a subunit of Complex I of the respiratory chain, which transfers electrons from NADH to ubiquinone. However, NDUFA3 is an accessory subunit of the complex that is believed not to be involved in catalysis. 
