Disruption of the early-life microbiota alters Peyer's patch development and germinal center formation in gastrointestinal-associated lymphoid tissue.

coli had significant increases in serum IgG levels ( Figure 6 I) and a slight increase in ileal IgG that did not reach statistical significance ( Figure 6 G), but not in IgA ( Figures 6 F and 6H).

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