Suitable for in vitro expansion of NK cells from human fresh or cryopreserved peripheral blood, umbilical cord blood, or concentrated leukocyte sources. Characterized by high expansion efficiency and high percentage of target cells. After 14 days of culture, the total cell count can be amplified approximately 50-100-fold from the initial mononuclear cells. The NK cell count can be amplified over 500-fold, with purity reaching 70%-90% (due to individual variations, some samples may exhibit NK cell purity below 70% or above 90% after induction).