Before revision: There are 209 congeners of polychlorinated biphenyls (PCB) as well as 209 congeners of polybrominated diphenyl ethers (PBDE).Congeners of oleic acids can modify cell membrane behavior protecting against tumors or having effects on blood pressure.Congeners refer to the other elements in a group in the periodic table.
After revision: Congeners refer to the other elements in a group in the periodic table.