FIG. 4.

Absolute differences in the PCB congener distributions of the Aroclor 1260 residues (controls minus experimental samples) as a result of priming with 26-BB (450 μM) (A) and priming with 4-4-BB (350 μM) (B). The PCB congener designations indicate the positions of the chlorine atoms on each phenyl ring, and the hyphen represents separation of the rings. The data shown are averages for duplicate samples primed with 4-4-BB (obtained at 120 days) and for triplicate samples primed with 26-BB (obtained at 100 days). The scale is the same for both panels.