PTK6 and posterior cortical atrophy: PTK6 and miR-214 co-transfection decreased the levels of endogenous PTK6 protein in PC3 and MDA-PCa-2b cells compared with PTK6 and NC mimic transfected cells, and, miR-214 mimic transfection did not affect the exogenous expression of PTK6 protein in MDA-PCa-2b cells (Fig. 5A, left two panels).