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Lymphotoxin-alpha (LT-α) or tumor necrosis factor-beta (TNF-β) is a protein that in humans is encoded by the LTA gene. Belonging to the hematopoietic cell line, LT-α exhibits anti-proliferative activity and causes the cellular destruction of tumor cell lines. As a cytotoxic protein, LT-α performs a variety of important roles in immune regulation depending on the form that it is secreted as. In other words, LT-α has both a membrane-bound and soluble form that perform distinct roles in immune regulation.