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ER stress loading after combined treatment using BZ and PTX or VNR in MDA-MB-231 cells. MDA-MB-231 cells were treated with BZ (25 nM), PTX (50 nM), or VNR (50 nM) alone or a combination of BZ and PTX, or BZ and VNR for 24 h and 48 h. Gene expression of CHOP and GRP78, which are related to ER stress loading, were assessed using real-time PCR.
