REP-PCR patterns obtained from the P. acnes isolates of patient 6 (A) and the S. epidermidis isolates of patient 13 (B). (A) Lanes 1 and 7, molecular size marker (pGEM DNA markers; Promega); lanes 2 and 3, skin isolates; lanes 4 to 6, isolates from the endodontic sample. (B) Lane 7, molecular size marker; lanes 5 and 6, isolates from the endodontic sample; lanes 1 to 4, skin isolates.