High prevalence of the C634Y mutation in the RET proto-oncogene in MEN 2A families in Spain. - Sanchez,B.; Robledo,M.; Biarnes,J.; Saez,M.E.; Volpini,V.; Benitez,J.; Navarro,E.; Ruiz,A.; Antinolo,G.; Borrego,S. (J Med Genet, 1999)