Predicted to be involved in mitochondrial respiratory chain complex I assembly. Located in mitochondrion. Part of respiratory chain complex I. Is active in mitochondrial inner membrane. Is expressed in several structures, including alimentary system; genitourinary system; heart; integumental system; and nervous system. Human ortholog(s) of this gene implicated in nuclear type mitochondrial complex I deficiency 24. Orthologous to human NDUFB9 (NADH:ubiquinone oxidoreductase subunit B9).