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Bivariate plots of the interaction between arsenic and zinc in their associations with Bifidobacterium in the unstratified population (n = 179) when all other exposures are fixed at the median, adjusting for covariates. For example, the first panel shows the association between arsenic and Bifidobacterium when zinc is fixed at the 10th, 50th, or 90th percentile and all other elements are fixed at their medians.
