- A 3-Mb region for the familial hemiplegic migraine locus on 19p13.1-p13.2: exclusion of PRKCSH as a candidate gene. Dutch Migraine Genetic Research Group. Ophoff, R.A., Terwindt, G.M., Vergouwe, M.N., van Eijk, R., Mohrenweiser, H., Litt, M., Hofker, M.H., Haan, J., Ferrari, M.D., Frants, R.R. Eur. J. Hum. Genet. (1996)