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and unlabelled forward primer of 2/3, 7.5 μl of Promega master mix (Promega, Madison, WI) 1.5 μl of sample and 5.9 μl HPLC water. Thermal cycling consisted of an initial denaturation of 5 min at 94°C, followed by three cycles of 1 min at 94°C, 2 min at 50°C and 1 min at 72°C, followed by 35 cycles of 20 sec at 94°C, 1 min at 50°C and 1 min 72°C, with a final extension of 10 min at 72°C, and cooling to 10°C. A 20 μl restriction mixture, containing 0.5 μl Epigenetics inhibitor of both PCR-products, 1 μl of BstUI (Westburg, Leiden, The Netherlands), 4 μl of the appropriate buffer and 14 μl milliQ water (Millipore, Bellerica, MA, USA), was incubated at 60°C during 3 h. Five μL of the restriction reaction was purified by ethanol precipitation. The obtained pellet was resolved in 13.1 μl deionised formamide (AMRESCO, Solon,

Ohio), 0.1 μl ROX500 and 0.3 μl HD400 GeneScan size standards (Applied Biosystems, Foster City, CA) followed by denaturation at 96°C for 2 min and immediate cooling on ice. The restriction fragments were electrophoresed on an ABI PRISM 310 (Applied Biosystems), whereby only the fluorescently labelled 5′ terminal restriction fragments (TRFs) were visualized. The T-RFLP pattern many obtained from a sample with a mixed microflora consists of one TRF for each of the different species present. Theoretically the number of peaks (TRFs) reflects the number of different species DNA Damage inhibitor present in a sample. Identification of the peaks in a T-RFLP pattern, in other words assignation of a species name to each TRF, is based on comparison with

a library composed of TRFs that have been obtained from pure cultures of well-identified reference strains or pure 16S rDNA clones, identified by sequence determination. The TRF length of a single species can also be determined by carrying out computer assisted (i.e. virtual) restriction analysis of published 16S rRNA sequences. The peak values in the library entries are the averages of the peak values obtained after testing different strains or cloned 16S rRNA genes of each species. The choice of the restriction enzyme used is important. We chose BstUI, based on in silico analysis of 16S rRNA genes [39] and on literature [40], indicating that this restriction enzyme was well suited for maximal differentiation between Lactobacillus species based on the length of the terminal 5′ restriction fragment of their 16S rDNA, i.e. their TRF.