- Formation of a transplacental mutagen, 1,3-Di(4-sulfamoylphenyl)triazene, from sodium nitrite and sulfanilamide in human gastric juice and in the stomachs of hamsters. Endo, H., Noda, H., Kinoshita, N., Inui, N., Nishi, Y. J. Natl. Cancer Inst. (1980)