MUC5AC and periodontitis: Our results are comparable to those of Nagynte et al. [11] who enriched natural oral communities in a mucin-based medium, under anaerobiosis, also testing the effect of adding heat-inactivated serum on community composition, finding that the mucin-rich medium supported a community enriched for certain periodontitis-associated bacteria, such as T. denticola, with very low levels of health-associated commensals, while addition of serum favored the growth of other periodontitis-associated taxa, including P. gingivalis and F. alocis [11].