- Biochemical and structural analysis of missense mutations in N-acetylgalactosamine-6-sulfate sulfatase causing mucopolysaccharidosis IVA phenotypes. Sukegawa, K., Nakamura, H., Kato, Z., Tomatsu, S., Montaño, A.M., Fukao, T., Toietta, G., Tortora, P., Orii, T., Kondo, N. Hum. Mol. Genet. (2000)