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Surface expression of TRAIL receptors does not differ in TRAIL-resistant and TRAIL-sensitive cells. Surface expression of the four TRAIL receptor isotopes (R1, R2, R3 and R4) was analysed by flow cytometry with specific PE-conjugated antibodies. Isotype-matched antibodies were used as control for unspecific binding. Receptor expression levels were comparable in CALU-1 and H460 cells.
