## Table 2 |
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Taxonomic comparison for 3 main bacterial taxa between frozen and unfrozen samples |
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Taxon |
F* |
UF1h* |
UF3h* |
p value F vs UF1h |
p value F vs UF3h |

Bacteroides;uncultured bacterium |
19 | 13 | 9 | 0.044 | 9.68e-05 |

Prevotellaceae;uncultured;human gut metagenome | 7 | 6 | 3 | 0.6804 | 0.0222 |

Bifidobacterium;uncultured bacterium |
2 | 4 | 8 | 0.2257 | 0.0007 |

Statistical analysis was performed using Poisson regression model; *p* value < 0.05 is considered significant; n = 4 subjects; * Values are mean proportion
of sequences (%).

F = frozen; UF1h = unfrozen during 1 h; UF3h = unfrozen during 3 h; Taxonomy is indicated at the genus level and if not possible at the family level.

Cardona * et al.*

Cardona * et al.* *BMC Microbiology* 2012 **12**:158 doi:10.1186/1471-2180-12-158