NLK and posterior cortical atrophy: Representative examples of staining are shown in Fig. 1a (I-IX), which show that epithelial cells from benign prostate gland samples have strong nuclear NLK staining (Fig. 1a IV) and weak Nurr1 staining (Fig. 1a VII), and also that low NLK levels (Fig. 1a VI) correlate with high Nurr1 levels (Fig. 1a IX) in the same PCa specimens (high-grade PCa).