- Mapping to 1q23 of the human gene (NDUFS2) encoding the 49-kDa subunit of the mitochondrial respiratory Complex I and immunodetection of the mature protein in mitochondria. Procaccio, V., de Sury, R., Martinez, P., Depetris, D., Rabilloud, T., Soularue, P., Lunardi, J., Issartel, J. Mamm. Genome (1998)