Two germline missense mutations at codons 804 and 806 of the RET proto-oncogene in the same allele in a patient with multiple endocrine neoplasia type 2B without codon 918 mutation. - Miyauchi,A.; Futami,H.; Hai,N.; Yokozawa,T.; Kuma,K.; Aoki,N.; Kosugi,S.; Sugano,K.; Yamaguchi,K. (Jpn J Cancer Res, 1999)