FLG and Alzheimer disease: Despite focusing on identified deregulated markers of AD, with the exemplars of FLG, SPINK5, mir-146b, and alpha diversity of Proteobacteria, significant differences were uncovered for several molecular factors, such as mir-375, mir-21, Th1/Th2 ratio (measured by the IL-8/IL-6 ratio) and Proteobacteria abundance, with the latter being positively correlated with the expression levels of mir-375 (rho = 0.21).