Cells were plated at 5000 cells/well in a 96-well plate. After 5 hours, the media was replaced and trastuzumab (10 μg/ml) was added. After 48 hours, Caspase-Glo® 3/7 Assay (Promega, G8091) reagent was added to the wells. The plate was incubated for 1 hr at room temperature and the luminescence was read by spectrophotometer. The luminescence reading was normalized to the mock treatment of each cell line to calculate relative apoptosis.
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