Histogram distribution of the rupture length for EGF-EGFR complex in KYSE-150 cells. Rupture length for EGF-EGFR complex obtained on (A) control KYSE-150 cells, (B) 10 μM oridonin treated KYSE-150 cells, (C) 30 μM oridonin treated KYSE-150 cells, (D) 50 μM oridonin treated KYSE-150 cells, (E) 2.5 mM NAC and 50 μM oridonin treated KYSE-150 cells, (F) 2.5 mM NAC treated KYSE-150 cells by EGF-functionalized AFM tips. Data was expressed as mean ± S.D., n > 6000.