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Flow cytometry analysis of N10 L6 hairpins showing the specific signal amplification on HER2+ breast cancer cells using HCR system. (a) The complete HCR system showed a fluorescence shift of the AF647 signal in comparison to H1 alone on BT‐474 cells. (b) MDA‐MB‐468 cells showed only negligible amplification of the signal in comparison to H1 alone.
