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Fig. 4. Examples of terminal restriction fragment length polymorphism profiles: (A) and (B) (Marsh, 2005) show electropherograms from RsaI digestion of 16S rRNA genes amplified from DNA extracted from two different soil samples, the insert in (A) shows an expanded size range (50–100 bases) in the electropherogram; (C) and (D) (Cadillo-Quiroz et al., 2006) are electropherograms from archael 16S rRNA genes amplified from DNA extracted from two different acidic peat bogs in central New York. The archaeal groups represented by distinctive terminal restriction fragments are: Methanosarcinaceae (MS), Methanosaetaceae (MT), rice cluster-I (RC-I), rice cluster-II (RC-II), marine benthic group D (MBD) and Methanomicrobiales: group E1 (E1), group-E1' (E1'), group E2 (E2).
