(a-d) Formation of protein inclusions in SY5Y cells expressing FL (a) or the indicated truncated forms of Sph1 (b-d) was induced by 12 h lactacystin treatment. After extensive washes, cells were maintained in serum-supplemented (serum+) or serum-free (serum−) media, and in the absence (Control) or presence of 10 mM 3-MA, an inhibitor of macroautophagy. Graphs show the relative fold difference in the number of cells containing either Sph1 Agm (left) or Agg (right) observed under different recovery conditions. Values are mean+s.e. (n=4). *Significant versus serum+ condition. See also Supplementary Figs S1-S5. 