TRIM71 and testicular germ cell tumor: TRIM71 is highly expressed in several GCT-derived cell lines (Rybak et al., 2009; Chang et al., 2012; Torres-Fernández et al., 2019) (Supplementary Figure 8A), and is upregulated in TGCT seminoma and non-seminoma patients (Tang et al., 2017; Supplementary Figures 8B–D).