“…The congeners investigated were unlabelled or labelled PCB-3, PCB-5, PCB-15, PCB-30, PCB-31, PCB-47, PCB-65, PCB-77, PCB-101, PCB-116, PCB-118, PCB-126, PCB-153, and PCB-196 (Goto et al, 1974a, b;Matthews & Anderson, 1975a, b;AbdelHamid et al, 1981;Beran et al, 1983;Shimada & Sawabe, 1984;Koga et al, 1990;van Birgelen et al, 1996;Pereg et al, 2001;NTP, 2006aNTP, , b, 2010. In some cases, mixtures of individual congeners were used (Öberg et al, 2002;NTP, 2006c, d).…”