Preparation of new antisera has permitted more comprehensive immunological analyses of the two families of Methanomicrobiales. Methanomicrobiaceae and Methanosarcinaceae, and the species Methanobrevibacter arboriphilus. Immunological analysis was carried out with antibody probes against 23 strains, including almost all genera and species of methanogens. The absence of cross-reactions between families of methanogens was confirmed. Methanomicrobium and Methanogenium were found to be immunologically related. Extensive cross-reactions occurred among six strains of Methanosarcinaceae, but none occurred among three strains of M. arboriphilus when tested with the S probe, i.e., the last antiserum dilution of the titration curve's plateau
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