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fax +1 410 955 0629, email email@example.com Studies in animal models and cell lines show that vitamin A and related retinoids play a major role in immunity, including expression of mucins and keratins, lymphopoiesis, apoptosis, cytokine expression, production of antibody, and the function of neutrophils, natural killer cells, monocytes or macrophages, T lymphocytes and B lymphocytes. Recent clinical trials suggest that vitamin A supplementation reduces morbidity and mortality in differentdoi:10.1017/s0029665199000944 fatcat:ea2uinyo4jfdhay5szhv6kqv6i