Another recent study demonstrated the presence of P. gingivalis-derived lipopolysaccharides in brain samples from AD patients (Poole et al., 2013) and the presence of gingipains, a class of P. gingivalis proteases, in neurons, tau tangles, and Aβ of individuals with AD (Dominy et al., 2019). The gene discussed is MAPT; the disease is Alzheimer disease.