GPX4 and cancer: Phylloquinone, MK4 and menadione also efficiently rescued cells from ferroptosis triggered by well-established ferroptosis inducers17 including a GPX4 inhibitor (1S,3R)-RSL3 (RSL3) in fibrosarcoma HT-1080 cells (Fig. 1d and Supplementary Videos 1 and 2), as well as in other cancer and non-cancer cell lines (Extended Data Fig. 1c,d).