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KLRF1 is a gene that codes for a protein that is helps to facilitate the natural killer-mefiated cytolysis of PHA-induced lymphoblasts and is strongly expressed in the peripheral blood leukocytes and the spleen, with a weaker expression in the lymph nodes and the adult liver. There are four isoforms of KLRF1, with lengths of 232, 182, 64, and 78 amino acids and weights of approximately 27, 21, 7, and 9 kDa respectively. There have been studies conducted on diseases and disorders relating to this gene, including hepatitis b and hepatitis.