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The distribution densities of IgA+, IgG+, and IgM+ cells in the small intestine of sheep after infection with Moniezia benedeni. (A) The distribution density of IgA+ cells; (B) The distribution density of IgG+ cells; (C) The distribution density of IgM+ cells; (D) The total densities of IgA+, IgG+, and IgM+ cells. P < 0.05 means significant difference.
