(i,j) Immunoblots of brain lysosomes incubated with LRRK2 and increasing concentrations of GAPDH (i) or RNase A (j). All values are mean + s.e.m.; differences with lysosomes incubated with the protein alone were significant at *P 0.05, unpaired t-test. Full-length blots and gels in Supplementary Figure 12. 