Dechlorination of 2,3,5,6-CB by a primary enrichment culture with BH sediment (5.0%, wt/vol [dry weight]). Mole percent and chlorines-per-biphenyl data are from a single culture. Symbols: ■, mole percent for 3-CB; ◊, 2,5-CB; •, 2,6-CB; ▵, 3,5-CB; ○, 2,3,5-CB; ⧫, 2,3,6-CB; and □, 2,3,5,6-CB. ▾, chlorines per biphenyl.