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Northern hybridization of MT1a and MT2a in aging Arabidopsis leaves. Total RNA (8 μg) was isolated from young (Y), mature (M), mid-senescent (S1), and almost completely senescent (S2) leaves. RNA was processed as in Figure 4. Filters were hybridized with MT1a antisense (A) or MT2a antisense (B) riboprobes. C, Ethidium bromide-stained gel.
