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Aging-associated changes in skin and gut microbiota composition. Relative abundances of phyla on the face, hand, and gut. In the facial area, Firmicutes are most abundant in childhood, while Proteobacteria is most prominent in adulthood. For the hand microbiota, Proteobacteria was found to be the most predominant phylum from childhood to old age. Firmicutes, on the other hand, are most abundant in the gut across all age groups. (Created with BioRender.com) (accessed on 20 May 2022).
