Release of the methanogen strains, Mbb. millerae SM9 and Methanobrevibacter sp. D5 which belong to the Methanobrevibacter gottschalkii clade, for use in developing a microtiter plate-based growth inhibition assay as part of PGgRc 20-FONT-LAB-AGR -MET-5.4 (Screening Lactic Acid Bacteria to discover anti-methanogen activities for methane mitigation).