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The circular genome sequence of the chemolithoautotrophic euryarchaeon Methanothermobacter marburgensis, with 1,639,135 bp, was determined and compared with that of Methanothermobacter thermautotrophicus. The genomes of the two model methanogens differ substantially in protein coding sequences, in insertion sequence (IS)-like elements, and in clustered regularly interspaced short palindromic repeats (CRISPR) loci.
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Liesegang et al. (2010) studied this question.
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