Microbial network analysis of the 'core' fecal microbiota of MHC congenic BALB/c mice.  Notice the more complex interactions (represented by the number of lines connecting dots (ie. species) within MHC heterozygote communities (bottom row). In a forthcoming manuscript we discuss the possibility that MHC heterozygosity may be favored evolutionarily by promoting a more beneficial microbiome. H2 refers to the mouse MHC region and the superscripted characters denote H2 haplotypes.
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