PRTN3 and rheumatoid arthritis: Some find significant enrichment of P. gingivalis in ACPA positive individuals at risk for RA but only at periodontally healthy sites [9], others highlight Filifactor alocis [45], or species in the Prevotella and Veillonella genera [21] and yet others report a significant role of Aa, Filifactor alocis, Campylobacter rectus, Porphyromonas endodontalis and Treponema vincentii as important bacterial network hubs [18].