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Congener (chemistry) : ウィキペディア英語版 | Congener (chemistry)
In chemistry, congeners are related chemical substances "related to each other by origin, structure, or function". ==Common origin and structure==
*Polychlorinated biphenyls (PCBs) are a family of 209 congeners. Polybrominated diphenyl ethers (PBDEs) are another family of 209 congeners. Any significant quantity of PCBs or PBDEs is by default a blend of multiple molecule types because each molecule forms independently, and chlorine does not strongly select which site(s) it bonds to.
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