Turesky R J, Wishnok J S, Tannenbaum S R, Pfund R A, Buchi G H
Carcinogenesis. 1983;4(7):863-6. doi: 10.1093/carcin/4.7.863.
Two mutagenic compounds have been isolated and purified from commercial beef extract. These two compounds have chemical, chromatographic, spectroscopic and biological behavior indistinguishable from those of the two known mutagens 2-amino-3-methyl-imidazo-[4,5-f]-quinoline and 2-amino-3,8-dimethyl-imidazo-[4,5-f]-quinoxaline.