- Toxicity of 2,2',5,5'-tetrachlorobiphenyl and its metabolites, 2,2',5,5'-tetrachlorobiphenyl-3.4-oxide and 2,2',5,5'-tetrachlorobiphenyl-4-ol to cultured cells in vitro. Stadnicki, S.S., Allen, J.R. Bulletin of environmental contamination and toxicology. (1979)