STYXL1 and neurodegenerative disease: Given that the MK-STYX-induced neurites in PC-12 cells have neuronal properties, PC-12 cells can serve as an ideal model to understand the molecular mechanism of MK-STYX in neuronal differentiation and to study in correlation with primary neurons, which may provide insight into how pseudophosphatases exert their important roles in the pathology of neurodegenerative diseases.