GSTK1 and hepatoblastoma: Immunoblot analysis of the relevant organelle-containing fractions [54] demonstrated that GSTK1 clearly coenriches with the peroxisomal marker CAT and the mitochondrial protein TOMM22 (Figure 1), which is consistent with (i) predictions that the protein contains peroxisomal and mitochondrial targeting information within its mature protein sequence [25] and (ii) its previously described dual localization in mitochondria and peroxisomes in human hepatoblastoma cells [17].