- A family with isolated hyperparathyroidism segregating a missense MEN1 mutation and showing loss of the wild-type alleles in the parathyroid tumors. Teh, B.T., Esapa, C.T., Houlston, R., Grandell, U., Farnebo, F., Nordenskjöld, M., Pearce, C.J., Carmichael, D., Larsson, C., Harris, P.E. Am. J. Hum. Genet. (1998)