(e, f) Transcriptional change (obtained by Affymetrix array) by spermidine treatment of all autophagy-related genes categorized into GO terms of macroautophagy (GO:0016236), microautophagy (GO:0016237) or autophagy in general (GO:0006914) at day 3 (e) and day 10 (f) of chronological ageing yeast. Data represent means of two independent arrays from independent biological samples. 