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Total levels of IgM, IgG3, IgG2b, IgG2a, IgG1, IgE, and IgA were measured with luminex in serum of germ-free (GF) males (M) (n = 5), GF females (F) (n = 5), conventional (conv) males (n = 8), conventional females (n = 10), and the GF recipient male or female mice that received the gut microbiota from the same or opposite gender (n = 10 per group). * indicates p < 0.05.
