Figure 2.

Illustration of bacteria and prokaryotic domains implicated in Alzheimer’s disease (AD), Parkinson’s disease (PD), and amyotrophic lateral sclerosis (ALS). Note how the Akkermansiaceae and Prevotellaceae families are both implicated in these three diseases; the Lactobacillaceae and Oscillospiraceae families are involved in PD and ALS; the Bacteroidiceae and Bifidobacteriaceae families are implicated in AD and ALS, while the Enterobacteriaceae family is involved in AD and PD. The Lachnospiraceae, Peptostreptococcaceae and Clostridiaceae families are involved in AD, ALS, and PD.