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Transmission Electron Microscopy of Plastid Ultrastructure in Leaves of 21-Day-Old Dark-Germinated Seedlings.
(A) Undifferentiated plastid of wild-type leaves (grown without close contact with sucrose).
(B) Amyloplast of wild-type leaves (grown in close contact with sucrose).
(C) Etioplast of abi3 leaves.
(D) Etioplast of abi3 dark-initiated leaves.
pl, plastid; prb, prolamellar body; stg, starch granule. 
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