Proposed pathways for fluorene degradation and the bacteria involved. 1, Arthrobacter sp. strain F101 (5, 9); 2, Terrabacter sp. strain DBF63 (28); 3, Brevibacterium sp. strain DPO1361 (44); 4, Pseudomonas sp. strain F274 (11); 5, Burkholderia cepacia F297 (12); and 6, Sphingomonas sp. strain LB126 (47).