Our data demonstrated mRNA PAT net lengthening activity for two other La module proteins, LARP4B and LARP1 (Figure 4 and 9), the latter of which is a regulator of ribosome biogenesis and a pro-cancer protein (Aoki et al., 2013; Tcherkezian et al., 2014; Fonseca et al., 2015; Lahr et al., 2017). Here, LARP1 is linked to cancer.