We used a set of GPX4-OE retroviruses (17) to overexpress each of three GPX4 isoforms (cGPX4, mGPX4, or nGPX4) in P14 cells, and those transduced P14 cells (mAm+) were transferred separately into recipient mice, followed by LCMV Cl13 infection (Figure 7A). Here, GPX4 is linked to infection.