No abstract available
MeSH terms
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Aged
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Aged, 80 and over
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Aging / immunology*
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Antibody Formation / immunology
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Female
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Humans
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Immune Tolerance / immunology
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Immunity, Cellular / immunology
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Intestinal Mucosa / immunology*
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Lymphoid Tissue / immunology*
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Male
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Peyer's Patches / immunology