This family is the C-terminal domain of NADH-ubiquinone oxidoreductase 21 kDa subunits from fungi.

1: Primary structure and mitochondrial import in vitro of the 20.9 kDa subunit of complex I from Neurospora crassa. Azevedo JE, Nehls U, Eckerskorn C, Heinrich H, Rothe H, Weiss H, Werner S; Biochem J. 1992;288:29-34. PMID:1445273