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Sources of Natural killer cells for immunotherapy. NK cells for cell therapy applications can originate from different sources: Peripheral blood NK cells (PB NK cells) (A), allogeneic umbilical cord blood NK cells (CB-NK Cells) (B), NK cell cancer cell lines (NK-92) (C), human embryonic stem cells (hESC) and inducible pluripotent stem cells (iPSCs) (D). Advantages and limitations with the different NK cell sources vary as described in the NK cell isolation section.
