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Ultrastructure of leaf plastids in wild type and mutants. Leaves of 14-d-old seedlings were fixed and examined by transmission electron microscopy. A and B, Wild type (WT); C and D, ppi1; E and F, ppi2. A, C, and E, Plastids in mesophyll cells. B, D, and F, Plastids in guard cells. Bars = 1 μm.
