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The capturing efficiency and purity of HLA-A2 target cells from a solution containing different amounts of background cells. A total of 50 target cells were mixed with 20,000, 200,000, 2 million, and 20 million background cells. Error bars show 1 SD (n = 3). For ease of detection, the target HLA-A2 cells and background cells are stained with green and red fluorescent dyes, respectively.
