PSAP and Splenomegaly: Western blot analysis showed significantly increased levels of several proteins involved in the autophagy/lysosomal pathway in spleen and liver lysates of the 2 month old C9orf72 deficient mice compared to littermate controls, including LC3-I, LAMP1, and prosaposin (PSAP), even before the appearance of an obvious splenomegaly phenotype, suggesting that autophagy/lysosome defects might precede anatomical spleen abnormalities (Fig. 10a, b).