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Cytotoxicity expressed by hFasL-PA317 packaging cells and culture supernatant. (A) The percentage of 51Cr released after cell death was measured in an acute assay after incubation of the FasL packaging cell line or the control cKrox packaging cell line with the indicated target cell at various effector:target cell ratios. (B) As in A, except the cell-free culture supernatant was incubated with the target cells instead of the packaging cell line.
